Version 2, published October 12, 2026
Ending the twice-yearly clock change
United States by state: Census 2020–2024 · Asked October 12, 2026 at 2:17 PM of 300 people
Synthetic simulation: these answers come from Jev's judgement of invented people, not from a survey.
What stands out
- Age “75 to 95” chose Keep standard time all year most: 80%, against 47% overall.
- Party lean (modelled) “Independent or no lean” chose No preference most: 40%, against 16% overall.
- Age “75 to 95” lean further toward support than everyone: +34 points, against +17 overall.
- Age “18 to 24” lean further toward oppose than everyone: +11 points, against +17 overall.
Hypotheses
People with children at home say the clock change disrupts their sleep or routine more than those without.
H₀ Net lean among Children at home is the same as net lean among No children at home.H₁ Net lean among Children at home is higher than net lean among No children at home. (what you expect)Not supported · Children at home: net lean +20 · No children at home: net lean +15 · gap +5 points · 97 and 203 people
Each person's figure, in ten bands: how many people (weighted) fall in each. Triangles mark the means.
−1000+100Children at home: mean +20No children at home: mean +15
Welch's t-test, one-sided: t = 3.63, df = 290, p < 0.001. H₀ rejected at the 5% level.
Gap, 95% confidence interval: +2 to +7 points. Effect size (Cohen's d): 0.40, small.
Group People Effective size Mean SD (points) 95% CI of the mean Children at home 97 97 +20 7.9 +18 – +21 No children at home 203 203 +15 13.9 +13 – +17 SD is the spread of people's figures, in points (for a scale, points of its range). The effective size counts people by their weights.
Verdicts weigh size: supported takes a gap of 5 points or more the expected way; contradicted, 5 or more the other way; anything between is not supported.
With invented people, Jev's answers vary less than real people's, so p-values come out smaller than a real survey's would. How big a gap is matters more than its p-value.
Why this test
Each person's figure is an average of Jev's probabilities (or, for runs before October 2026, their single pick), so the test compares means rather than counts of 0 and 1.
Two groups: Welch's t-test, which does not assume the two groups vary equally; its degrees of freedom come from the data (Welch–Satterthwaite). Against everyone, the group is compared with everyone else.
One group on two questions: the same people answer both, so each person's difference is tested (a paired t-test), which removes what differs between people.
People count by their population weights, and each side's size is its effective size: (sum of weights)² ÷ sum of squared weights. "Higher" and "lower" are tested one-sided, "differs" two-sided, at the 5% level.
Groups are large, so this gives nearly the same p-value as a z-test; the t-test matters for small groups, such as two traits combined.
At a glance
Every question's answers, one bar each. Each question has its own answers and colours.
1What would you prefer the country do about the clock change?
2Does changing the clocks noticeably affect your sleep or your routine for a few days?
How the questions relate
Question by question
Pick two questions: each row is the people giving one answer to the first, split by their answers to the second. People count by their probabilities, so the margins are the run's shares.
What would you prefer the country do about the clock change? × Does changing the clocks noticeably affect your sleep or your routine for a few days?
| Share | Yes | No | |
|---|---|---|---|
| 31% | Keep daylight saving time all year | 57% | 43% |
| 47% | Keep standard time all year | 60% | 40% |
| 5% | Keep changing the clocks twice a year | 58% | 42% |
| 16% | No preference | 55% | 45% |
300 people answered both. Each row adds up to 100%.
Segments
People grouped by how they answered every question, into 4 segments of people who answer alike (k-means on their answer probabilities). Each shows its size, the trait values most over-represented in it, and its answers (top bar) beside everyone's (faded).
Segment 1 · 30% of people (91)
- Age “75 to 95”: 40%, against 12% of everyone
- Marital status “Widowed”: 18%, against 6% of everyone
- Age “65 to 74”: 36%, against 14% of everyone
- Disability “Has a disability”: 56%, against 22% of everyone
1. What would you prefer the country do about the clock change?
2. Does changing the clocks noticeably affect your sleep or your routine for a few days?
Segment 2 · 27% of people (81)
- Age “18 to 24”: 17%, against 11% of everyone
- Children at home “Children at home”: 49%, against 32% of everyone
- Party lean (modelled) “Democratic-leaning”: 64%, against 44% of everyone
- Age “45 to 54”: 21%, against 15% of everyone
1. What would you prefer the country do about the clock change?
2. Does changing the clocks noticeably affect your sleep or your routine for a few days?
Segment 3 · 26% of people (79)
- Age “25 to 34”: 35%, against 19% of everyone
- Household income “$150,000 or more”: 48%, against 28% of everyone
- Party lean (modelled) “Republican-leaning”: 70%, against 42% of everyone
- Work “Working”: 95%, against 60% of everyone
1. What would you prefer the country do about the clock change?
2. Does changing the clocks noticeably affect your sleep or your routine for a few days?
Segment 4 · 16% of people (49)
- Party lean (modelled) “Independent or no lean”: 63%, against 14% of everyone
- Household income “Lives in group quarters”: 16%, against 4% of everyone
- Home “Lives in group quarters”: 16%, against 4% of everyone
- Work “Unemployed, looking for work”: 16%, against 4% of everyone
1. What would you prefer the country do about the clock change?
2. Does changing the clocks noticeably affect your sleep or your routine for a few days?
The number of segments is the one, from 2 to 5, whose segments are furthest apart for their own spread (the Calinski–Harabasz score; higher is better: 2: 304, 3: 393, 4: 406, 5: 356), leaving out any with a segment under 5% of people. The same run always gives the same segments.
Question 1 · Multiple choice
What would you prefer the country do about the clock change?
- Age “75 to 95” chose Keep standard time all year most: 80%, against 47% overall.
- Party lean (modelled) “Independent or no lean” chose No preference most: 40%, against 16% overall.
- Age “65 to 74” chose Keep standard time all year most: 70%, against 47% overall.
- Work “Not in the labor force” chose Keep standard time all year most: 65%, against 47% overall.
Adjusted with Claude Beta
By age, adjusted
- 18 to 24: Keep daylight saving time all year 41% · Keep standard time all year 17% · Keep changing the clocks twice a year 18% · No preference 25%
- 25 to 34: Keep daylight saving time all year 43% · Keep standard time all year 20% · Keep changing the clocks twice a year 17% · No preference 20%
- 35 to 44: Keep daylight saving time all year 39% · Keep standard time all year 26% · Keep changing the clocks twice a year 16% · No preference 18%
- 45 to 54: Keep daylight saving time all year 38% · Keep standard time all year 33% · Keep changing the clocks twice a year 16% · No preference 13%
- 55 to 64: Keep daylight saving time all year 32% · Keep standard time all year 38% · Keep changing the clocks twice a year 16% · No preference 14%
- 65 to 74: Keep daylight saving time all year 35% · Keep standard time all year 29% · Keep changing the clocks twice a year 20% · No preference 16%
- 75 to 95: Keep daylight saving time all year 32% · Keep standard time all year 24% · Keep changing the clocks twice a year 24% · No preference 20%
Jev's answers moved toward Claude's for 50 of the same people, group by group of age. On 17 held-out questions with published results, this landed about 8 to 18 points from the real result, against Jev's 21 to 34. Jev's own answers are below; hypotheses, drivers and downloads use them.
Jev's own answers
Most likely answer: Keep daylight saving time all year 36% · Keep standard time all year 54% · Keep changing the clocks twice a year 0% · No preference 10%
Jev's average confidence 47%
± is the 95% sampling interval for these people (an effective 300 after weights): how far another draw of the same population could move a figure.
Model error is separate and wider: on 20 published questions, four answers in five landed within ±22 points of the real survey's share (±25 within groups).
Claude, 50 people: Keep daylight saving time all year 38% · Keep standard time all year 25% · Keep changing the clocks twice a year 19% · No preference 17%
Jev and Claude are 22 points apart: far apart.
By age: the answer where they differ most
- 18 to 24 (7 asked): Keep changing the clocks twice a year Jev 5%, Claude 19%
- 25 to 34 (11 asked): Keep changing the clocks twice a year Jev 5%, Claude 18%
- 35 to 44 (9 asked): Keep changing the clocks twice a year Jev 6%, Claude 20%
- 45 to 54 (7 asked): Keep standard time all year Jev 41%, Claude 25%
- 55 to 64 (5 asked): Keep standard time all year Jev 52%, Claude 28%
- 65 to 74 (5 asked): Keep standard time all year Jev 70%, Claude 30%
- 75 to 95 (6 asked): Keep standard time all year Jev 80%, Claude 30%
With 50 people, gaps of a few points can be chance. A large gap means the result depends on the model: compare with real results where you can.
What drives the answers
How much of the variation in people's answers lines up with each trait. Traits overlap: pay travels with role, so both can rank high for the same reason.
With the other traits held constant
Each group's difference from its trait's largest group in the share choosing “Keep standard time all year”, in points, from one regression with every trait in at once, so a trait no longer gets credit for the traits that travel with it (pay with role). The dot is that effect with its 95% interval; the ring is the same difference one trait at a time, as the ranking above reads it. Where the two part, the trait's apparent effect came from others.
Age against 25 to 34
Party lean (modelled) against Democratic-leaning
Disability against No disability
Household income against $150,000 or more
Division against South Atlantic
12 more traits
Marital status against Married
Education against High school diploma or GED
Race and ethnicity against White
Sex against Woman
Voted in 2024 (modelled) against Voted
Work against Working
Health coverage against Has health coverage
Citizenship against US citizen
Children at home against No children at home
Veteran against Not a veteran
Born against Born in the US
Home against Lives in an owned home
Together the traits account for 88% of the variation in people's answers (300 people).
Age and Work together
Share choosing “Keep standard time all year”, the most chosen answer, in each combination of the two traits that drive answers most. Combinations of fewer than 30 people are greyed. Everyone: 47%
| Age \ Work | Working | Unemployed, looking for work | Not in the labor force |
|---|---|---|---|
| 18 to 24 | 30% | 34% | 27% |
| 25 to 34 | 30% | 35% | 29% |
| 35 to 44 | 34% | 44% | 48% |
| 45 to 54 | 37% | 21% | 53% |
| 55 to 64 | 47% | 36% | 67% |
| 65 to 74 | 64% | 36% | 74% |
| 75 to 95 | 83% | – | 80% |
On the map
Share answering “Keep daylight saving time all year”.
Most places here have fewer than 30 people. To fill the map, build the population with “At least this many in each subgroup” set to 30: about 1,500 people for these places, weighted back to their true sizes.
By division
Every place (50)
By race and ethnicity
By age
By education
By household income
By party lean (modelled)
By sex
By work
By segment
Who answered what
For each answer, the people who gave it most surely, as Jev read them. They show who answered, not why.
Keep daylight saving time all year
Mia Allen
24 years old
a woman
lives in a home their household owns
probably leans Republican (estimated from people like them and their county's 2024 vote, not stated by them)
White
Texas
probably voted in the 2024 election (estimated)
household earns $150,000 or more a year
a US citizen
never married
not a veteran
West South Central
no children at home
has a bachelor's degree
has health coverage
no disability
has a job
born in the US
82% sure
Minh Chen
31 years old
a man
lives in a rented home
probably leans Republican (estimated from people like them and their county's 2024 vote, not stated by them)
White
Florida
probably voted in the 2024 election (estimated)
household earns $100,000–149,999 a year
a US citizen
never married
not a veteran
South Atlantic
no children at home
went to some college or has an associate's degree
has health coverage
no disability
has a job
born in the US
81% sure
Jordan Thompson
65 years old
a man
lives in a home their household owns
probably leans Republican (estimated from people like them and their county's 2024 vote, not stated by them)
White
Oregon
probably voted in the 2024 election (estimated)
household earns $150,000 or more a year
a US citizen
married
not a veteran
Pacific
has children at home
has a bachelor's degree
has health coverage
no disability
has a job
born in the US
79% sure
Keep standard time all year
Leila Thomas
79 years old
a woman
lives in a home their household owns
probably leans Democratic (estimated from people like them and their county's 2024 vote, not stated by them)
White
California
probably voted in the 2024 election (estimated)
household earns $50,000–74,999 a year
a US citizen
widowed
not a veteran
Pacific
no children at home
has a graduate degree
has health coverage
has a disability
is not working or looking for work (retired, student, caring for family, or other)
born in the US
95% sure
Jordan Harris
69 years old
a woman
lives in a home their household owns
probably leans Democratic (estimated from people like them and their county's 2024 vote, not stated by them)
Black
Texas
probably did not vote in the 2024 election (estimated)
household earns $75,000–99,999 a year
a US citizen
divorced
not a veteran
West South Central
no children at home
finished high school (or a GED)
has health coverage
has a disability
is not working or looking for work (retired, student, caring for family, or other)
born in the US
93% sure
Camila Rivera
83 years old
a woman
lives in a home their household owns
probably leans Democratic (estimated from people like them and their county's 2024 vote, not stated by them)
White
Georgia
probably voted in the 2024 election (estimated)
household earns $50,000–74,999 a year
a US citizen
married
not a veteran
South Atlantic
no children at home
has a bachelor's degree
has health coverage
has a disability
is not working or looking for work (retired, student, caring for family, or other)
born in the US
92% sure
Keep changing the clocks twice a year
No one chose this.
No preference
Ava Hill
25 years old
a woman
lives in a home their household owns
probably leans to neither party (estimated from people like them and their county's 2024 vote, not stated by them)
Black
Mississippi
probably did not vote in the 2024 election (estimated)
household earns $100,000–149,999 a year
a US citizen
never married
not a veteran
East South Central
no children at home
did not finish high school
has health coverage
no disability
is unemployed and looking for work
born in the US
74% sure
Robert Martin
29 years old
a man
lives in group quarters (a dorm, barracks, nursing home, or prison)
probably leans Republican (estimated from people like them and their county's 2024 vote, not stated by them)
Black
Virginia
probably did not vote in the 2024 election (estimated)
no household income of their own
a US citizen
never married
not a veteran
South Atlantic
no children at home
went to some college or has an associate's degree
has no health coverage
no disability
is not working or looking for work (retired, student, caring for family, or other)
born in the US
72% sure
Thomas Baker
39 years old
a man
lives in group quarters (a dorm, barracks, nursing home, or prison)
probably leans Democratic (estimated from people like them and their county's 2024 vote, not stated by them)
Hispanic
Missouri
cannot vote, as they are not a US citizen
no household income of their own
not a US citizen
never married
not a veteran
West North Central
no children at home
did not finish high school
has health coverage
no disability
is not working or looking for work (retired, student, caring for family, or other)
born outside the US
66% sure
Question 2 · Yes or no
Does changing the clocks noticeably affect your sleep or your routine for a few days?
- Age “75 to 95” lean further toward support than everyone: +34 points, against +17 overall.
- Age “18 to 24” lean further toward oppose than everyone: +11 points, against +17 overall.
Adjusted with Claude Beta
By age, adjusted
- 18 to 24: Yes 51% · No 49%
- 25 to 34: Yes 53% · No 47%
- 35 to 44: Yes 52% · No 48%
- 45 to 54: Yes 51% · No 49%
- 55 to 64: Yes 48% · No 52%
- 65 to 74: Yes 39% · No 61%
- 75 to 95: Yes 42% · No 58%
Jev's answers moved toward Claude's for 50 of the same people, group by group of age. On 17 held-out questions with published results, this landed about 8 to 18 points from the real result, against Jev's 21 to 34. Jev's own answers are below; hypotheses, drivers and downloads use them.
Jev's own answers
Most likely answer: Yes 95% · No 5%
Jev's average confidence 59%
± is the 95% sampling interval for these people (an effective 300 after weights): how far another draw of the same population could move a figure.
Model error is separate and wider: on 20 published questions, four answers in five landed within ±22 points of the real survey's share (±25 within groups).
Claude, 50 people: Yes 49% · No 51%
Jev and Claude are 9 points apart: some way apart.
By age: the answer where they differ most
- 18 to 24 (7 asked): No Jev 45%, Claude 49%
- 25 to 34 (11 asked): No Jev 44%, Claude 47%
- 35 to 44 (9 asked): No Jev 43%, Claude 49%
- 45 to 54 (7 asked): No Jev 43%, Claude 47%
- 55 to 64 (5 asked): Yes Jev 57%, Claude 45%
- 65 to 74 (5 asked): No Jev 39%, Claude 59%
- 75 to 95 (6 asked): No Jev 33%, Claude 56%
With 50 people, gaps of a few points can be chance. A large gap means the result depends on the model: compare with real results where you can.
How firm
Each person's lean from “No” to “Yes”: the gap between Jev's probabilities for the two, in ten bands. An even result can be two camps or a crowd in the middle; this shows which.
0% firmly toward “Yes” and 0% firmly toward “No” (a gap of 60 points or more); 67% within 20 points of even.
What drives the answers
How much of the variation in people's answers lines up with each trait. Traits overlap: pay travels with role, so both can rank high for the same reason.
With the other traits held constant
Each group's difference from its trait's largest group in net lean, in points, from one regression with every trait in at once, so a trait no longer gets credit for the traits that travel with it (pay with role). The dot is that effect with its 95% interval; the ring is the same difference one trait at a time, as the ranking above reads it. Where the two part, the trait's apparent effect came from others.
Age against 25 to 34
Disability against No disability
Children at home against No children at home
Household income against $150,000 or more
Work against Working
12 more traits
Division against South Atlantic
Education against High school diploma or GED
Citizenship against US citizen
Voted in 2024 (modelled) against Voted
Sex against Woman
Race and ethnicity against White
Party lean (modelled) against Democratic-leaning
Home against Lives in an owned home
Marital status against Married
Born against Born in the US
Veteran against Not a veteran
Health coverage against Has health coverage
Together the traits account for 81% of the variation in people's answers (300 people).
Age and Disability together
Net lean in each combination of the two traits that drive answers most: support minus oppose, in points of average probability. Combinations of fewer than 30 people are greyed. Everyone: +17
| Age \ Disability | No disability | Has a disability |
|---|---|---|
| 18 to 24 | +11 | +18 |
| 25 to 34 | +12 | +15 |
| 35 to 44 | +16 | +12 |
| 45 to 54 | +13 | +17 |
| 55 to 64 | +7 | +26 |
| 65 to 74 | +15 | +34 |
| 75 to 95 | +20 | +39 |
On the map
Support minus oppose (or yes minus no), from Jev's probabilities: green leans for, orange against.
Most places here have fewer than 30 people. To fill the map, build the population with “At least this many in each subgroup” set to 30: about 1,500 people for these places, weighted back to their true sizes.
By division
Lean: support minus oppose, in points of average probability
Every place (50)
Lean: support minus oppose, in points of average probability
By race and ethnicity
Lean: support minus oppose, in points of average probability
By age
Lean: support minus oppose, in points of average probability
By education
Lean: support minus oppose, in points of average probability
By household income
Lean: support minus oppose, in points of average probability
By party lean (modelled)
Lean: support minus oppose, in points of average probability
By sex
Lean: support minus oppose, in points of average probability
By work
Lean: support minus oppose, in points of average probability
By segment
Lean: support minus oppose, in points of average probability
Who answered what
For each answer, the people who gave it most surely, as Jev read them. They show who answered, not why.
Yes
Linh Clark
80 years old
a woman
lives in a home their household owns
probably leans Republican (estimated from people like them and their county's 2024 vote, not stated by them)
White
New York
probably did not vote in the 2024 election (estimated)
household earns under $25,000 a year
a US citizen
married
not a veteran
Middle Atlantic
no children at home
finished high school (or a GED)
has health coverage
has a disability
is not working or looking for work (retired, student, caring for family, or other)
born in the US
75% sure
Betty Adams
75 years old
a woman
lives in a rented home
probably leans Democratic (estimated from people like them and their county's 2024 vote, not stated by them)
of another race or more than one race
California
probably voted in the 2024 election (estimated)
household earns under $25,000 a year
a US citizen
never married
not a veteran
Pacific
has children at home
finished high school (or a GED)
has health coverage
has a disability
is not working or looking for work (retired, student, caring for family, or other)
born in the US
73% sure
Aaliyah Rivera
81 years old
a woman
lives in a home their household owns
probably leans Republican (estimated from people like them and their county's 2024 vote, not stated by them)
White
New York
probably voted in the 2024 election (estimated)
household earns $75,000–99,999 a year
a US citizen
married
not a veteran
Middle Atlantic
no children at home
finished high school (or a GED)
has health coverage
has a disability
is not working or looking for work (retired, student, caring for family, or other)
born in the US
73% sure
No
Thomas Baker
39 years old
a man
lives in group quarters (a dorm, barracks, nursing home, or prison)
probably leans Democratic (estimated from people like them and their county's 2024 vote, not stated by them)
Hispanic
Missouri
cannot vote, as they are not a US citizen
no household income of their own
not a US citizen
never married
not a veteran
West North Central
no children at home
did not finish high school
has health coverage
no disability
is not working or looking for work (retired, student, caring for family, or other)
born outside the US
64% sure
Robert Martin
29 years old
a man
lives in group quarters (a dorm, barracks, nursing home, or prison)
probably leans Republican (estimated from people like them and their county's 2024 vote, not stated by them)
Black
Virginia
probably did not vote in the 2024 election (estimated)
no household income of their own
a US citizen
never married
not a veteran
South Atlantic
no children at home
went to some college or has an associate's degree
has no health coverage
no disability
is not working or looking for work (retired, student, caring for family, or other)
born in the US
60% sure
Nancy Flores
56 years old
a woman
lives in a home their household owns
probably leans Republican (estimated from people like them and their county's 2024 vote, not stated by them)
Asian
Illinois
cannot vote, as they are not a US citizen
household earns $150,000 or more a year
not a US citizen
married
not a veteran
East North Central
no children at home
has a bachelor's degree
has health coverage
no disability
is not working or looking for work (retired, student, caring for family, or other)
born outside the US
57% sure
How this was made
Who they are: Adults living in the United States in 2024.
What they were told before answering: Most of the country moves its clocks forward an hour in March and back in November. Congress has considered keeping one time all year: either permanent daylight saving time (lighter evenings, darker winter mornings) or permanent standard time (lighter mornings, earlier sunsets).
Population built from the “United States by state: Census 2020–2024” template: 300 invented people, seed 2f13515f. Each person's traits come from the population's stated proportions; Jev (jev-1.13.0) judged how each would answer from those traits and from the context shown here, nothing else. Shares average each person's chance of each answer (Jev's full distribution), which lands closer to real surveys than counting each person's most likely answer; those counts are shown beside them.
Two kinds of error
Sampling: the ± beside each figure is a 95% interval for the people in this population, using their effective number after weights (Kish). It says how much the figure could move with another draw of the same population, nothing more. Rows too small to read (under 30 people, or an interval wider than ±15 points) are greyed out and left out of what stands out.
Model: how far real surveys land from Studio, measured on published questions with known results. Four answers in five landed within ±22 points of the real share on 20 questions that are not scales, and within ±23 on 24 scales (the average level within ±15 points of 100). This error is not chance and does not shrink with more people; it is why a contrast between groups is safer to read than a single percentage.
Traits marked (modelled) are estimated, not recorded: no Census record says how anyone votes. Each person's party lean and 2024 turnout come from Cooperative Election Study respondents like them, calibrated so every county matches its certified 2024 presidential result and turnout. Fine for including or comparing groups; not anyone's stated party, and not a poll.
Synthetic simulation: these answers come from Jev's judgement of invented people, not from a survey.