Help using Base SAS procedures

Levels & first differences on proc panel

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Levels & first differences on proc panel

Hi, I am trying to use proc panel with the /GMM twolevel options but I always get as my output first differences even though I do not have the NOLEVELS option chosen.  Isthere something I need to be doing to get the levels output isntead?  My data is monthly over 10 months for 30,000 students if that matters.

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