Colleagues,
R 2.11.1, OS X. Please forgive my ignorance of some issues related to ANOVA.
I am trying to replicate some SAS analyses that use type 3 sum of squares. The
model that I am using is:
lm(YVAR ~ DATA$SEQ + DATA$SEQ %in% DATA$ID + DATA$PERIOD +
FRAME$FORMULATION)
The intent is to use SEQ, PERIOD, FORMULATION and (SEQUENCE nested in ID) as
factors in the ANOVA.
I can replicate the sum of squares for model / error / total. I have two
questions:
1. SAS reports type 3 sum of squares for each of the factors. How can
I obtain these?
2. I am not sure that the coding of nesting in the formula is correct:
DATA$SEQ %in% DATA$ID
Any advice on this would be appreciated.
Dennis
Dennis Fisher MD
P < (The "P Less Than" Company)
Phone: 1-866-PLessThan (1-866-753-7784)
Fax: 1-866-PLessThan (1-866-753-7784)
www.PLessThan.com
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