On May 19, 2012, at 6:58 PM, jacaranda tree wrote:
Hi all,
I have been struggling with ANOVAs on R. I am new to R, so I created
a simple data frame, and I do some analyses on R just to learn R and
then check them on SPSS to make sure that I am doing fine. Here is
the problem that I've run into:
when we use the aov function, it uses SS Type I as default (on SPSS
it is Type III). Then I used the Anova function under cars package
using the command:
mod <- lm(DV
~ IV1*IV2, data = mydata,
contrasts=list(IV1=contr.sum,
IV2=contr.sum))
Anova(mod, type=”3”)
Are you perhaps having a problem due to using a non-plain-text editor?
Those quotes look "wrong".
compare " with ”
I do not think the second version of double-quote will be recognized
correctly.
Above, both of my IVs are between-SS variables. But still, results
from this model do not match the results from SPSS (I have to say
they are not too different either). But I was wondering if I am
doing something wrong. If what I am doing is okay, then my next
question is can I use the same set of commands (for Anova function)
if one of my IVs was within-SS and the other IV was between-SS?
Thank you very much!
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Part of learning R is moving away from pretty versions of formatting,
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David Winsemius, MD
West Hartford, CT
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