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en:survey:opt-in-live [25.06.2015 10:13] – [Hinweise] alexander.ritter | en:survey:opt-in-live [15.07.2015 21:19] – admin |
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====== Multi-Wave Surveys with Self-Selection ====== | ====== Multi-Wave Surveys with Self-Recruited Respondents ====== |
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As a general rule, participants' email addresses have to be known beforehand when carrying out a multi-wave survey as the respondents have to be invited, at some point, to a survey wave at a later date. However, if participants have been recruited via links on a website, social media or advertising banners, then their email addresses are not known beforehand. This chapter explains different technical solutions that guarantee the respondents' anonymity. | As a general rule, participants' email addresses have to be known beforehand when carrying out a multi-wave survey as the respondents have to be invited, at some point, to a survey wave at a later date. However, if participants have been recruited via links on a website, social media or advertising banners, then their email addresses are not known beforehand. This chapter explains different technical solutions that guarantee the respondents' anonymity. |
All parts in the questionnaire are arranged one after the other in one questionnaire. "Mailings" is set as the access mode for the questionnaire. | All parts in the questionnaire are arranged one after the other in one questionnaire. "Mailings" is set as the access mode for the questionnaire. |
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If the participants' email addresses are __not__ known in advance, a second questionnaire with a question [[:de:create:questions:opt-in|Opt-In für E-Mail-Verteiler]] is created. "public" is set as the access mode for this questionnaire. | If the participants' email addresses are __not__ known in advance, a second questionnaire with a question [[:de:create:questions:opt-in|Opt-in for Email Distribution List]] is created. "public" is set as the access mode for this questionnaire. |
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Create a mailing (ID 1 in the example) which sends a invitation to the second time of measurement after 7 days. In the "Reminder/Follow-up" tab, the "Type of follow-up" is set so that there is a reminder or follow-up. In the email text the %link% placeholder has to be used (as usual). | Create a mailing (ID 1 in the example) which sends a invitation to the second time of measurement after 7 days. In the "Reminder/Follow-up" tab, the "Type of follow-up" is set so that there is a reminder or follow-up. In the email text the %link% placeholder has to be used (as usual). |
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<code php> | <code php> |
// time which the page interruption was first accessed in stored in the $timepart1 variable. | // Time which the page interruption was first accessed in stored in the $timepart1 variable. |
// isset() und registerVariable() prevent this time being changed when the page is accessed again (e.g. if the page is refreshed) and/or emails being duplicated. | // isset() und registerVariable() prevent this time being changed when the page is accessed again (e.g. if the page is refreshed) and/or emails being duplicated. |
if (!isset($timepart1)) { | if (!isset($timepart1)) { |