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st: Poolability tests and count data

Subject   st: Poolability tests and count data
Date   17 Oct 2002 15:17:17 +0100


i am going to work with a panel (300 firms, information from 18 years each) and want to know if i "can" pool the data or if i have to use panel-methods. The well known tests like the LR- or Breusch-Pagan-Test are always used with non-discrete data but not with count data. My dataset contains count data and i want to know if i should use the NEGBIN-modell or the random or fixed effect-panel modell with count data. Which test do i have to make and how can i perform it with STATA?

Yours sincerly,

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