search for: comorbidit

...m running into some trouble with using the fastbw() function breaking up natural groups of variables. Is there any way I can specify to keep certain variable together? In particular, if interactions are included I would also like to keep the main effects in the model. Another example is a group of comorbidity variables that I would like to be assessed all together and not as separate components as this makes more sense from the perspective of interpretation. The Force = ... option seems to only work for pre-specified variables and does not solve my problem. In the case of the comorbidites, the variabl...