Respondent driven sampling (RDS) is a network sampling technique typically employed for hard-to-reach populations (e.g. drug users, men who have sex with men, people with HIV). Similar to snowball sampling, initial seed respondents recruit additional respondents from their network of friends....

We designed and fielded an experimental module in the American Life Panel (ALP) where we ask individuals to report the number of their purchases and the amount paid by debit cards, cash, credit cards, and personal checks. The design of the experiment features several stages of randomization....

Respondent driven sampling (RDS) is a network sampling technique typically employed for hard-to-reach populations (e.g. drug users, men who have sex with men, people with HIV). Similar to snowball sampling, initial seed respondents recruit additional respondents from their network of friends....

Die Datenqualität in Umfragedaten kann in vielen Fällen durch abweichendes Verhalten der Interviewer beeinträchtigt sein. Eine Fälschung liegt dann vor, wenn der Interviewer den kompletten Fragebogen oder Teile davon nicht erfragt, sondern die Antwort selbst produziert d.h. fälscht....