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st: why is stata dropping more dummies than necessary


From   "Indradeep Ghosh" <indradeepg@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: why is stata dropping more dummies than necessary
Date   Thu, 21 Oct 2004 01:53:17 +0000

hi all,
i am running fixed effects panel regressions (country by year by variable), but i am using time and country dummies for time and country fixed effects, plus a constant, instead of the xtreg command. i have 11 years and 30 countries - i find that stata drops 1 country dummy but two time dummies - i would have expected stata to drop only 1 time dummy. why is stata dropping 2? am i missing something obvious? this is not a matsize issue, since i set a large enough matsize for all my regressions. any help/suggestion will be greatly appreciated. many thanks.
deep


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