I have a df with 4 observations per company (4 quarter). However, for several companies I have less than 4 observations. When I don't have the 4 quarters for a firm I would like to delete all observations relative to the firm. Any ideas how to do this ?

I have a df with 4 observations per company (4 quarter). However, for several companies I have less than 4 observations. When I don't have the 4 quarters for a firm I would like to delete all observations relative to the firm. Any ideas how to do this ?

This is how the df looks like:

Quarter Year Company 1 2018 A 2 2018 A 3 2018 A 4 2018 A 1 2018 B 2 2018 B 1 2018 C 2 2018 C 3 2018 C 4 2018 C

In this df I would like to delete rows relative to company B because I only have 2 quarters.

Many thanks!

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