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HTH
Martin
_______________________
----- Original Message -----
From: "Pek-Hooi Soh" <psa28@sfu.ca>
To: <statalist@hsphsun2.harvard.edu>
Sent: Tuesday, March 03, 2009 9:18 PM
Subject: st: interpreting standardized coefficients in multiple regressions
with product terms
Hi Stata users, I used xtnbreg and standardized some of the key variables
(listcoef does not work for nbreg) and estimated the regression.
Regarding the interpretation of standardized coefficients, I found some
examples in Long and Reese (page 377-8) but they don't show regressions
with interaction terms.
If I have a standardized regression with standardized coefficients -0.2
for X1 and 0.56 for X1 and X2, will a change of 1 st dev in X1 give the
following effect on Y?
-0.2 + 0.56*(X2)
The change of 1 st dev in X2 is this.
1.67 + 0.56*(X1)
Do I assume a value of X1 and X2 in each case, by taking the min and max
and calculating the resulting effect?
How do I compare the effects of X1 and X2 on Y if there effects range from
a negative value to a positive value?
In an article it says if a standardized coefficient is closer to 1, it has
a stronger effect on Y. Does this apply to a standardized regression with
product terms?
Will appreciate your explanations and help.
Cheers
Pek
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