Hi all,

I am using CEM on a panel dataset with the k2k option.  I am currently matching observations by year (and a few other covariates).  I was wondering if there are any econometric problems while running regressions (post matching) with a matched sample which contains the following situation:

in year t observation_1 is matched with observation_2, but in year t+1 observation_1 is matched with observation_3.  That is, in different years the same firm is matched with different firms.

Thanks,

Nel