I wanted to know if there was a "smart way" of adding a regressor in panel regressions where: "if this regressor has zero variance in one cross-section, it is omitted".
For example, imagine that we regress electric demand for 40 countries and we add the variable electrification_rate in % to the list of regressors, in developped economies the rate will be 100% for all the sample and in this case, I would like to remove this regressor.
For econometric discussions not necessarily related to EViews.
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