Has anyone done a longitudinal study before? What was your incentive
model like?
We're asking participants to commit to 8 sessions, happening roughly two
weeks apart. We are fully prepared for drop-outs but want to minimize
this, obviously.
We'd considered giving people some money for each session (say $50), and
then reserving the same amount of money for the very end, which would be
handed over if they complete all 8 sessions. So they'd get $50 every
session for 8 sessions, and get an extra $400 at the end if they
attended all 8.
