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en:survey:unique-respondents [10.07.2018 11:27] – [Exclude multiple participation] mindset-geburt | en:survey:unique-respondents [10.07.2018 20:25] – [Data clearing] admin |
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====== Exclude Multiple Participation ====== | ====== Prevent Multiple Submissions by the Same Respondent ====== |
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Theoretically, in the standard setting an online questionnaire can be completed by anyone as often as desired. In scientific surveys it is usually not very attractive for the participant to answer an extensive questionnaire several times. However, the situation might be different if the survey contains a vote or if there is an incentive for filling in the form. | Theoretically, in the standard setting an online questionnaire can be completed by anyone as often as desired. In scientific surveys it is usually not very attractive for the participant to answer an extensive questionnaire several times. However, the situation might be different if the survey contains a vote or if there is an incentive for filling in the form. |
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Multiple participation can be restricted by [[:en:create:access|Access Restrictions]]. | **Note:** To restrict who may access the questionnaire at all, use [[:en:create:access]]. This is also where "serial" and "mailing" restrictions are set. |
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===== Individual participation keys ===== | ===== Individual participation keys ===== |
If multiple entries are expected in competitions data cleansing might help. It is very unlikely that a participant will fill out the same questionnaire several times with the same motivation. It is much more likely that they complete the questionnaire as quickly as possible. | If multiple entries are expected in competitions data cleansing might help. It is very unlikely that a participant will fill out the same questionnaire several times with the same motivation. It is much more likely that they complete the questionnaire as quickly as possible. |
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If one excludes "rusher" in the course of data cleansing one should already have identified most multiple participants. This could e.g., be done by identifying questionnaires that were answered extraordinarily quickly, as well as cases with more than 20% missing answers (cf. variable [[:en:results:variables#interview-fortschritt|MISSREL]]). See [[https://www.researchgate.net/publication/258997762|Leiner (2014)]]for more information on data cleansing. | If one excludes "rusher" in the course of data cleansing one should already have identified most multiple participants. This could e.g., be done by identifying questionnaires that were answered extraordinarily quickly, as well as cases with more than 20% missing answers (cf. variable [[:en:results:variables#interview-progress|MISSREL]]). See [[https://www.researchgate.net/publication/258997762|Leiner (2014)]] for more information on data cleansing. |
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If you collect the contact data for the competition separately from the other data ([[:de:create:questions:contact|Collect Contact Data Separately]]) you have to make sure that fast participants cannot register by using the PHP function ''[[:en:create:functions:casetime|caseTime()]]''. | If you collect the contact data for the competition separately from the other data ([[:de:create:questions:contact|Collect Contact Data Separately]]) you have to make sure that fast participants cannot register by using the PHP function ''[[:en:create:functions:casetime]]''. |