which gls model does not contain significant data variables which gls model includes non significant variables? what model has non significant variables what variables make up the best model what is the best model selection why does gls include variables what models do not include significant variables which model does not include non significant variances in the best models? which model would be best for over-fitting a model? what model has a large number of non significant variables which gls model includes most non-significant variables? what is gls model what is the best gls what if a model is non significant what model has significant variables which model includes some non significant vars which gls model includes a large number of non significant variables? what is the best gls model does forward selection account for autocorrelation why is the model selection script important