On 09/02/2011 15:05, pablo pazos wrote: > I agree with you Thomas but there's always some implicit semantics, I > mean: when there is no data, it is taken as false, but what happen if > the person who do the questionnaire do not try to make this question > false? May be he/her didn't want to answer, and this false could have > value/semantics in clinical or legal fields.
Hi Pablo, my point is that in some cases, researchers construct questionnaires for healthcare use that will have some purely boolean answers, and they simply won't use responses containing missing answers, i.e. they will only use clean data. A question like 'have you ever had children' for example in such a questionnaire can be modelled as Boolean if the researcher wants simply to divide the population into two - women who gave birth, and women who never did. Any response like 'don't know' would be discarded in such a study. I am not saying that this is good study design, or anything else (it isn't my area), but we can't prevent medical researchers from creating questionnaires with purely boolean answers, if that is what their statistical computing model requires. - thomas * * -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openehr.org/mailman/private/openehr-technical_lists.openehr.org/attachments/20110209/4de3b507/attachment.html>
