Last modified: 2014-06-11 16:07:01 UTC
A second (optional) parameter s should be added on top of t to the survival metric to limit the measurement of survival to the [t, t+s] interval, instead of the current [t, NOW]. This is useful to apply the metric consistently to users who may have registered at very different times.
[moving tickets as per bug 65903]
This bug has been made invalid through the transition to Wikimetrics. Since User Metrics is no longer actively maintained, I will mark these old bugs as Invalid.