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Panel data refers to multi-dimensional data frequently involving measurements over time in econometrics. It is also called longitudinal data in biostatistics.

-1 votes

Random effects model with PLM: "System is computationally singular"-Error?

I tried all the possible options in random.method, but I still got the same message - Error in solve.default(vcov(x)[names.coefs_wo_int, names.coefs_wo_int], : system is computationally singular: re …
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Instruments for Control Function Approach involving quadratic and interaction terms

My panel model is of the following form where x1 is the endogenous regressor and z is the moderator. y = f(x1, x1^2, x1z) The instrument for x1 is M (based on averages of similar observations except …