Last updated: 7 October 2026
Quick Answer: A dichotomous question is a closed survey question with exactly two mutually exclusive answers, such as yes or no, or true or false. Use it for facts, screening and filters that route people to follow-up questions. The American Community Survey's yes-or-no question on speaking another language at home is a textbook example.
A dichotomous question splits every respondent into one of two groups, with nothing in between. It is the simplest question type in research, fast to answer and easy to count.
Its simplicity cuts both ways. Two options are exactly right when reality has two states, such as owning a car or not, and quietly wrong when it does not, such as how much someone likes a brand.
Which Answer Pairs Make a Question Dichotomous?
A dichotomous question pairs one clear question with two opposite answers that together cover every respondent, and these dichotomous question examples show the common pairs. Most use yes or no, but any exhaustive pair works, such as true or false, agree or disagree, or have and have not.
The rows run from the most common pair to the least.
| Answer pair | Example question | Typical use |
|---|---|---|
| Yes / No | "Have you bought from us in the last 12 months?" | Screening and filters |
| True / False | "The price includes delivery: true or false?" | Knowledge and comprehension checks |
| Agree / Disagree | "I would recommend this to a friend." | Quick attitude splits |
| Fair / Unfair | "Was the refund decision fair?" | Judgments with a clear threshold |
| Male / Female | Sex as recorded on an official document | Fixed binary attributes only |
Federal surveys use the format as a gate. The US Census Bureau's American Community Survey language question asks "Does this person speak a language other than English at home?" with yes or no. Only a yes leads to questions about which language and how well the person speaks English.
When Should You Use a Dichotomous Question?
Use a dichotomous question when the true answer has two states, or when you need to route people into the right part of a survey. It works for factual checks, eligibility screens, awareness and past behavior, and less well for opinions that come in degrees.
Typical good uses:
- Screening: "Do you make the grocery decisions in your household?" decides who qualifies, as covered in the guide to survey screening questions.
- Filters: A yes routes people to follow-ups and a no skips them.
- Awareness: "Have you heard of this brand?" before any rating.
- Forced choice between two statements: Pew Research Center's guide to writing survey questions recommends offering a choice between two alternative statements instead of an agree-disagree item, to reduce acquiescence.
Are Yes-or-No Survey Questions Better Than Checklists?
Yes, for lists of items, asking yes or no about each one usually gives more accurate answers than a "select all that apply" checklist. People skim checklists and tick a few boxes, while a yes-or-no question for every item makes them consider each one.
Pew Research Center tested this directly in a 2019 experiment on its online panel. Estimates were on average 8 percentage points higher with item-by-item yes/no questions than with a checklist, and Pew found compelling evidence that the forced-choice format was more accurate. Being denied coverage by a health insurer, for example, came out at 19% with yes/no questions and 13% with the checklist.
The order of items barely changed between formats, so a checklist is acceptable for ranking options but not for measuring how common each one is.
What Is a Dichotomous Scale?
A dichotomous scale is a measurement scale with only two points, such as yes and no, coded as 1 and 0. Each answer is a dichotomous response, and several dichotomous items can be summed into a score, which is how many knowledge tests and checklists of symptoms or behaviors work.
A dichotomous scale example is a set of ten true-or-false product knowledge items, scored as the number answered correctly. It differs from a Likert scale, which offers graded agreement, because each item records only whether something is present, not how strongly.
How Do You Analyze a Dichotomous Variable?
To analyze a dichotomous variable, report each share with its margin of error, compare groups with a chi-square test, and use logistic regression to see what predicts a yes. Coding answers as 1 and 0 makes the average equal to the share answering yes.
One warning runs the other way. Turning a continuous answer, such as age or spend, into a dichotomous variable throws information away. Douglas Altman and Patrick Royston showed in the BMJ in 2006 that splitting a variable at the median costs as much statistical power as discarding a third of the data.
When Does a Two-Option Question Mislead?
A two-option question misleads when the real answer has more than two states, when some people genuinely do not know, or when the wording nudges people toward yes. In each case the clean split hides a messier reality, and the error does not show up in the data.
Three traps account for most problems:
- False binaries: "Are you satisfied?" collapses a range of views into two boxes.
- No exit: Without a "don't know" option, unsure respondents guess.
- Yes-saying: Some respondents lean toward agreeing, especially with leading wording, as shown in these biased survey question examples.
When opinions come in degrees, a graded scale or an open question does more work. The guide to open-ended survey questions covers when to let people answer in their own words.
How Do Yes-or-No Questions Work on Phone and WhatsApp?
Yes-or-no questions are among the easiest to answer by voice or chat, because the answer is one word and no scale has to be held in memory. That makes them useful for reaching people who would abandon a long web form.
AI phone interviews can ask a yes-or-no screener and follow a yes with a probing question in the same call, and WhatsApp-native interviews accept a typed reply or a voice note, with no link and no app. Alchemic publishes 60+ languages including Spanish and Hindi, with managed fieldwork or bring your own sample across 14 markets including the USA and the UK.
Once it has the client's brief, Alchemic designs and tailors the discussion guide to handle these risks before fielding, rather than leaving that work to the buyer. For a simple yes-or-no poll of an engaged audience, a standard survey tool is quicker and cheaper.