On Mar 23, 2011, at 9:31 AM, mipplor wrote:

datafilename="E:/my documents/r/sex/bysex1.csv"
data.sex=read.table(datafilename,header=T)
data.sex
      y.sex.age.region.c.n
1   1980,F,A,N,-18.15,13.61
2   1980,F,A,N,-18.61,13.04
3   1980,F,A,N,-18.81,12.32
4    1990,F,A,N,-21.12,11.7
5   1990,F,A,N,-20.77,11.58
6    1990,F,A,N,-21.6,13.34
7    1990,F,A,N,-21.78,12.6

model.anova<-aov(c~age*sex,data=data.sex)
Error in eval(expr, envir, enclos) : object 'age' not found


  i just wanna do a anova test. but the error message is as above,,,
  what should i do to shoot this problem ? Should i define the age?

You should read the help page for read.table more thoroughly with particular attention to the `sep` argument. At the moment you have one column in your data.frame.

--

David Winsemius, MD
West Hartford, CT

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