I have a dataset of a few thousand employees and want to compare time-to-terminate by their source of hire. The data is for a four year period. Out of the dataset about 15% have terminated, while the rest are still with the company.
I considered survival analysis but the employees started at many different times. Is there anyway to work around this? Or is there a more appropriate analysis?
EDIT: I found this paper which explains how to handle my problem of variable sample size: http://www.amstat.org/chapters/northeasternillinois/pastevents/presentations/summer05_Ibrahim_J.pdf