Re: st: interpretation of interaction terms

[Shehzad Ali <sia500@york.ac.uk>]

Thanks, Dave, for your reply. My question is about interaction of 
log-transformed and untransformed variables (continuous or dummy). The 
links suggested don't discuss interpretation of interactions of transformed 
variables.

Friedrich: This is not a homework/exam question :) I am running an analysis 
where income variable in log-transformed and is interacted with programme 
membership variable (dummy) and regressed on log-transformed healthcare 
expenditure variable. There is also interactions between log-transformed 
income and level of education (untransformed continuous) variables and also 
between two dummy variables. These are all regressed on log-transformed 
dependent variable.

Thank you,

Shehzad


On Dec 15 2008, David Airey wrote:

> See these pages:
>
> http://www.ats.ucla.edu/stat/stata/webbooks/reg/default.htm
>
> http://www.ats.ucla.edu/stat/stata/seminars/stata_vibl/default.htm
>
> -Dave
>
> On Dec 14, 2008, at 7:31 PM, Shehzad Ali wrote:
>
> > Hi,
> >
> > Could someone please help me interpret the following:
> >
> > 1. Coefficient on an interaction term for a dummy and log- 
> > transformed variable in an OLS model when the dependent variable is  
> > in natural units or is also log-transformed
> >
> > 2. Coefficient on an interaction term for an untransformed  
> > continuous and log-transformed variable in an OLS model when the  
> > dependent variable is in natural units or is also log-transformed
> >
> > 3. Coefficient on an interaction term between a dummy and log- 
> > transformed variable in a probit regression
> >
> > Thank you,
> >
> > Shehzad
> > *
> > *   For searches and help try:
> > *   http://www.stata.com/help.cgi?search
> > *   http://www.stata.com/support/statalist/faq
> > *   http://www.ats.ucla.edu/stat/stata/
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/