Taken from Introduction to Econometrics from Stock and Watson, 2003, p. 215: Y=B0 + B1*ln(X) + u ~ A 1% change in X is associated with a change in Y of 0.01*B1 ln(Y)=B0 + B1*X + u ~ A change in X by ...

Linear regressions fitted to cross-sectional data of tentimes display heteroskedasticity, that is, error variances that are not constant. A common modeling strategy ...