This work aimed at presenting a faster general algorithm for estimation of panel data models with two fixed effects, when it is compared with PROC PANEL, working with balanced or unbalanced data. The results by simulation showed that until with a large data base (50,000 observations) only a few seconds were necessary for estimation, while in the PROC PANEL, the estimation wasn’t possible due to out of memory. You can find more details on paper SGF 354-2011
http://support.sas.com/resources/papers/proceedings11/354-2011.pdf
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