Our center has met a problem with the longitudinal survey. Since some elder participants died and others have changed their phone numbers, we can only trace around half of the original participants. I am a bit worried. What can we do?
Home>Online Community of Practices>Our center has met a problem with the longitudinal survey. Since some elder participants died and others have changed their phone numbers, we can only trace around half of the original participants. I am a bit worried. What can we do?
