Dear Statalist,
My question is more about statistics than about Stata, but also so elementary
that I'd like to post this problem here.
In ANOVA I have difficulty in understanding the notion of Partial Sum of
Squares - being the default option in Stata's anova.
In understanding statistical methods, I use linear regression (OLS) as a
reference method, since regression allows me to draw pictures in my mind
and is a method that I feel comfortable with. ANOVA is not so intuitive
to me. But since the underlying methods of OLS and ANOVA are essentially
the same (both General Linear Models - GLMs), I regard the difference
between these methods as "different interfaces" to the same GLM.
My question is:
'How can I obtain the Partial Sum of Squares of each of
the variables in the case of a two way anova with interaction by us of
regression analysis?'
or - more applied - :
How do I get the Partial SS of foreign in:
*---------------- begin example --------------------------
sysuse auto, clear
anova mpg foreign rep78 foreign#rep78
*------------------ end example -----------------------------
using regression analysis?
Kind regards,
Adriaan Hoogendoorn
GGZ inGeest, Amsterdam.
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