when variables are indexed in the model selection equation how to select models which equation is strongly correlated in the case of an array? what is the y equation used for in statistics? what is the purpose of the selection process in stata what is model selection? __________ is an ordinal model, which is also the function of the regressors. it is a selection equation. why is it necessary to use a choice method? which regressors are strongly coupled with each other? what is regressors and regressors which type of model selection is based on the selection equation? what is the model selection of sql what is model selection how does the model selection algorithm work what is the purpose of the math model selection process which regressor is the most closely correlated? why does a model selection need to be discrete what kind of variables are the regressors of the heckman model if each variable in a model is positively and negatively correlated (y-epsilon or delta), the correlation is which of the following equations represents the discrete version of a model?