I was composing a long reply in the original thread and it got somewhat unwieldy, so let’s move things over here:Q. Is there any way to see how the regression c… ...

Regression models using fractional polynomials of the covariates have appeared in the literature in an ad hoc fashion over a long period; we provide a unified description and a degree of formalization ...

Studies analyzing clustered data sets using both multilevel models (MLMs) and ordinary least squares (OLS) regression have generally concluded that resulting point estimates, but not the standard ...