[R] "2 not defined because of singularities" appearing after introducing Fixed Effects

[asdir]

Sorry, please nevermind. It seems to have been an econometrical problem after
all.

(A variable consisting of 2 or more of the 150 Country-Dummies for the fixed
effects causes perfect multicollinearity as well. So does a variable that
differs over cross-sections but not over periods, seemingly. I was not aware
before...)
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