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2010 Apr 26
1
Dropping "trailing zeroes" in longitudinal data
Background: Our research group collected data from students via the web
about their drinking habits (alcohol) over the last 90 days. As you
might guess, some students seem to have lost interest and completed some
information but not all. Unfortunately, the survey was programmed to
"pre-populate" the fields with zeroes (to make it easier for students to
complete).
Obviously, when