| Field | Before | After |
|---|---|---|
| Field Final Sample Size: Number of Clusters (Unit of Randomization) | Before | After . |
| Field Was attrition correlated with treatment status? | Before | After No |
| Field Final Sample Size: Total Number of Observations | Before | After 28,510 individuals |
| Field Final Sample Size (or Number of Clusters) by Treatment Arms | Before | After 9,618 (CG), 9,392 (TG1), and 9,500 (TG2) |
| Field Is there a restricted access data set available on request? | Before | After Yes |
| Field Restricted Data Contact | Before | After [email protected] |
| Field Program Files | Before | After No |
| Field Is data available for public use? | Before | After No |
| Field | Before | After |
|---|---|---|
| Field Paper Abstract | Before | After This article examines the effects of embedding a link to an informational video in an email inviting people to participate in an online survey. A sample of 28,510 Danish parents of 15,000 children received an email invitation to participation in a nation-wide survey about their child and family. Clustered at the individual child level, we randomly assigned each parent couple to either a control group (CG) or one of two treatment groups. Parents in the CG received a typical survey invitation email. Parents in the two treatment groups received the same email—but with one important distinction: The email also included a link to an informational video of a researcher emphasizing the social significance of the survey and the value of the individual’s participation. |
| Field Paper Citation | Before | After Mogens Jin Pedersen, Anders Bo Bojesen, Signe Boe Rayce, Maiken Pontoppidan, Using Informational Video to Elicit Participation in Online Survey Research: A Randomized Controlled Trial, International Journal of Public Opinion Research, Volume 33, Issue 4, Winter 2021, Pages 946–959, https://doi.org/10.1093/ijpor/edaa023 |
| Field Paper URL | Before | After https://academic.oup.com/ijpor/article-abstract/33/4/946/6006402 |