Omitted Dummy Variables due to Collinearity

[Guest]

When using panel data and controlling for both time and fixed entity effects with the within estimator and year dummies why are two of my year dummies removed due to colinearity, does this affect the beta 1 coefficient estimate in any way?

[Carlo Lazzaro]

Guest:
please do not bump (and the follow the FAQ on how to post more effectively) Thanks.
Duplicate post. See https://www.statalist.org/forums/for...ing-controlled . Thanks.