Questionaires are often used in social sciences. Many people try to complete them very quickly and very often they only "guess" answers. Is there any statistical technique or any research in this area, how to identify which questionnaires are completed poorly?
I think that this is similar to detection of outliers, but which technique is the most relevant? Some persons have very strange behaviour, so they would be identified as outliers although their questionnaires are not fraudulent.
So how to distinguish between fraudulent questionnaire and very strange person?
I have already tried to identify fraudulent questionnaires but they claimed that they were only unique persons :-).