[R] aov p values for levels of a factor.

[John Sorkin]

Windows XP
R2.8.1

I am running an balanced aov, in which Time has 4 levels, Group has 2
levels:

fit2<-aov(Post ~ as.factor(Time)
+as.factor(Group)+as.factor(Group*Time)+Error(SS), alldata)

I would like to get a p value for each level of time, each level of
Group and each level of Group*Time. How can I do this? I get this, which
appears to be omnibus p values for the factors:

Error: SS
                 Df Sum Sq Mean Sq
as.factor(Group)  1 12.918  12.918

Error: Within
                        Df  Sum Sq Mean Sq F value   Pr(>F)   
as.factor(Time)          3 19.8486  6.6162  7.5652 0.002601 **
as.factor(Group)         1  3.4074  3.4074  3.8961 0.067109 . 
as.factor(Group * Time)  3 11.0076  3.6692  4.1955 0.024195 * 
Residuals               15 13.1183  0.8746                    
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’
0.1 ‘ ’ 1 

Thanks,
John


John David Sorkin M.D., Ph.D.
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)

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