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st: AW: Plotting 3 way continuous interactions in regression


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: Plotting 3 way continuous interactions in regression
Date   Thu, 13 Aug 2009 14:06:10 +0200

<> 

You use "_SAP" in your -regress- command, but "SAP" in your -global-s....

What exactly does Stata say after which command?



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Kris Anderson
Gesendet: Donnerstag, 13. August 2009 01:54
An: statalist@hsphsun2.harvard.edu
Betreff: st: Plotting 3 way continuous interactions in regression

Hi,

I am stuck on a piece of code that I can't seem to debug. I am trying to 
plot a 3-way interaction using the FAQ on plotting these interactions 
with covariates. The code hangs up as I try to compute 4 simple slopes. 
The program tells me the name of my interaction term is invalid. Can 
anyone see a problem here? I tried renaming the variable but it didn't help.

Thanks

regress avgdrink age sex gradedich white hisp csocanx caffil cpn SAF SP 
AP _SAP if currentdrinker > 0

sum csocanx
global hi=r(max)
global lo=r(min)
sum caffil
global HAF=r(mean)+r(sd)
global LAF=r(mean)-r(sd)
sum cpn
global HPN=r(mean) +r(sd)
global LPN=r(mean) -r(sd)
sum age
global mage=r(mean)
sum gradedich
global mgrade=r(mean)
sum white
global mwhite=r(mean)
sum hisp
global mhisp=r(mean)
global HPNHAF "csocanx + ($HPN)*SP + ($HAF)*SAF + ($HPN)*($HAF)*SAP"
global HPNLAF "csocanx + ($HPN)*SP + ($LAF)*SAF + ($HPN)*($LAF)*SAP"
global LPNHAF "csocanx + ($LPN)*SP + ($HAF)*SAF + ($LPN)*($HAF)*SAP"
global LPNLAF "csocanx + ($LPN)*SP + ($LAF)*SAF + ($LPN)*($LAF)*SAP"
lincom $HPNHAF /* slope 1*/
global b1 = r(estimate)
lincom $HPNLAF /* slope 2*/
global b2 = r(estimate)
lincom $LPNHAF /* slope 3*/
global b3 = r(estimate)
lincom $LPNLAF /* slope 4*/
global b4 = r(estimate)





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