J Test, Regression, Model Selection, Statistics, Deep Dives.
equations, the subscript i refers to the ith row of the data set. The country-specific variables are dummy variables which have a value of 1 or 0 depending on whether the ith row relates to that country. β=[β_0,β_1,…β_7] is the vector of regression coefficients in model A while γ=[γ_0,γ_1,…γ_7] is