Dear Nomi
There is probably no need to center the continuous variable in this case. You can
verify this for yourself by inspecting the VIF values, and checking that the values are
less than 10. Suppose your binary variable is "a" and the continous variable is "x". You
can create the interaction term by multiplication, or you can let SPSS do it for you by
specifying "a x a by x" .
I hope this helps,
Michael N. Mitchell
Data Management Using Stata -
http://www.stata.com/bookstore/dmus.htmlA Visual Guide to Stata Graphics -
http://www.stata.com/bookstore/vgsg.htmlStata tidbit of the week -
http://www.MichaelNormanMitchell.comOn 2010-11-09 1.43 AM, Nomi wrote:
> Hello all,
> I have run a hierarchical linear regression model and would like to
> include interactions between a binary variable and a continuous variable
> in the final step of the model.
> Could someone please advise me how this is done? Can I create a new
> variable by simply multiplying the two or do I need to first center the
> continuous variable?
> Thanks,
> Nomi
>
> =====================
> To manage your subscription to SPSSX-L, send a message to
>
[hidden email] (not to SPSSX-L), with no body text except the
> command. To leave the list, send the command
> SIGNOFF SPSSX-L
> For a list of commands to manage subscriptions, send the command
> INFO REFCARD
=====================
To manage your subscription to SPSSX-L, send a message to
[hidden email] (not to SPSSX-L), with no body text except the
command. To leave the list, send the command
SIGNOFF SPSSX-L
For a list of commands to manage subscriptions, send the command
INFO REFCARD
Locked
