- Thread starter fizix
- Start date
- Tags binary dependent variable

thanks for your response

I notice that this is a stepwise sort of procedure.

Since I'm only interested in main effects and interaction effects when everything else is controlled for, I can enter all four IVs and their possible interactions all at once right?

Or should I enter one interaction effect at a time?

Sorry, that was probably a very unclear question...

edit:

I guess I just don't understand all the stepwise stuff. Why can't you just put in all the variables and interactions you're interested in at once? Could someone explain that part more succintly to me?

I notice that this is a stepwise sort of procedure.

Since I'm only interested in main effects and interaction effects when everything else is controlled for, I can enter all four IVs and their possible interactions all at once right?

Or should I enter one interaction effect at a time?

Sorry, that was probably a very unclear question...

edit:

I guess I just don't understand all the stepwise stuff. Why can't you just put in all the variables and interactions you're interested in at once? Could someone explain that part more succintly to me?

Last edited:

You can use backward or forward proceedures, which start with either all terms and sequentially eliminate terms or start with the bare minimum and sequentially add terms until the optinimal model is found.

for the present sample , but a model which

is generalizable beyond sample data, then

stepwise procedures are ususally considered

of limited value (e.g.

http://www.philender.com/courses/linearmodels/notes4/swprobs.html

http://os1.amc.nl/mediawiki/images/Babyak_-_overfitting.pdf )

With kind regards

K.