Take the 2-minute tour ×  I want track a site's visitor
retention using Google Analytics, to see if unregistered users
are returning to it, within a time frame of 2+ months from now.
This blog post seems to be on the right track, but I want to
track unregistered users, so I don't have a "join date" or
similar variable at my disposal.  This other blog post suggests
using all 5 GA custom variables, using the first variable slot
on the first week, variable 2 on week 2, etc. This method will
allow me to track 5 weeks of visitors.  I want to track more
than 5 weeks of visitors, so I was thinking on using two custom
variables in GA: visitor's first visit date, and visitor's last
visit date.  How I can save the first visit date? Because if I
save another value in the same slot the old value will be
overwritten, and I don't know how reliable is to save that
variable conditionally (reading the __utmv cookie to check
whether the "first visit date" is set, if it isn't set I save
the current date)  share|improve this qu