https://communities.sas.com/t5/New-SAS-User/Fixed-variables-in-stepwise-selection/m-p/526029#M5042 Thank you very much for your help! Thu, 10 Jan 2019 13:08:34 GMT larameix 2019-01-10T13:08:34Z https://communities.sas.com/t5/New-SAS-User/Fixed-variables-in-stepwise-selection/m-p/526026#M5040 <P>Hello everybody,</P><P>&nbsp;</P><P>i want to perform regression&nbsp;&nbsp;analyses and used stepwise selection for selecting confounders. The&nbsp;problem is, that the independent variable i am interested in is not in the model in some cases. Therefore, i want to know if there is a way to somehow fix&nbsp;some&nbsp;of&nbsp;the&nbsp;independent variables so that they are always entering the model and only confounders are selected?</P><P>&nbsp;</P><P>Thanks in advance for your help!</P><P>&nbsp;</P> Thu, 10 Jan 2019 13:01:47 GMT https://communities.sas.com/t5/New-SAS-User/Fixed-variables-in-stepwise-selection/m-p/526026#M5040 larameix 2019-01-10T13:01:47Z https://communities.sas.com/t5/New-SAS-User/Fixed-variables-in-stepwise-selection/m-p/526028#M5041 <P>I have grave reservations about using any stepwise procedure. Just Google "Problems with stepwise regression" and you'll have enough reading material for a few weeks.</P> <P>&nbsp;</P> <P>Nevertheless, in PROC REG the INCLUDE option of the model statement forces specific variables to be used.</P> Thu, 10 Jan 2019 13:05:12 GMT https://communities.sas.com/t5/New-SAS-User/Fixed-variables-in-stepwise-selection/m-p/526028#M5041 PaigeMiller 2019-01-10T13:05:12Z https://communities.sas.com/t5/New-SAS-User/Fixed-variables-in-stepwise-selection/m-p/526029#M5042 Thank you very much for your help! Thu, 10 Jan 2019 13:08:34 GMT https://communities.sas.com/t5/New-SAS-User/Fixed-variables-in-stepwise-selection/m-p/526029#M5042 larameix 2019-01-10T13:08:34Z