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Asking Questions - The Definitive Guide To Questionnaire Design ...

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ASKING NONTHREATENING QUESTIONS ABOUT BEHAVIOR 57<br />

make an estimate based on rates that are either stored in memory as<br />

schema or computed on the spot from a sample of available data.<br />

A general finding is that as the number of experiences of an<br />

event increases above five, respondents are more likely to estimate<br />

than to count (Blair and Burton, 1987). When behaviors are regular<br />

and similar, such as brushing one’s teeth or eating breakfast,<br />

estimation will result in more accurate responses than counting<br />

(Menon, 1997). <strong>The</strong> selection of the time period influences whether<br />

respondents count or estimate. Data users unfamiliar with cognitive<br />

processes often believe they can obtain much more information by<br />

increasing the length of the time period that a question covers, but<br />

this belief is illusory.<br />

If the behavior is frequent, irregular, and relatively unimportant,<br />

such as making a telephone call or buying gasoline for one’s car,<br />

respondents asked about a short time period will simply count and<br />

report the number of events retrieved. Respondents asked about a<br />

longer time period, will typically count for a short time period and<br />

then compute an answer based on this rate. Not only does the<br />

longer time period not provide additional information, it may<br />

increase the possibility of a computation error when the respondent<br />

is required to extrapolate.<br />

If the behavior is regular, respondents will already have a rate<br />

stored in memory and will simply retrieve this rate and apply it to<br />

whatever time period is specified. It is obvious that increasing the<br />

time period for regular behaviors has no effect on the amount of<br />

data obtained. For example, if respondents are asked how many<br />

times they brush their teeth in a given period of time, they would<br />

simply multiple their daily rate by the number of days in the time<br />

period they are asked to report. Only for infrequent, irregular behavior,<br />

such as buying consumer durables or going to the doctor,<br />

does increasing the length of the time period increase the amount<br />

of information retrieved. <strong>The</strong>re are eight proven methods for improving<br />

the quality of reporting if respondents count.

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