Steven McKinney <smckin...@bccrc.ca> [2010.10.29] wrote:
> You can set up the data as
>
> > grade <- ordered(c("MVG", "VG", "VG", "G", "MVG", "G", "VG", "G", "VG"),
> > levels = c("G", "VG", "MVG"))
> wilcox.test(as.integer(grade) ~ sex, data = gradesbysex)
Thanks, this solved my problems. I'll just explain the problem with
ties, that is easier to understand than running jitter and comparing.
> As for the barplots, I think all you need to do is specify the row and column
> order you'd like.
>
> Try this example
>
> > barplot(VADeaths, beside = TRUE)
> > barplot(VADeaths[5:1,c(4, 2, 3, 1)], beside = TRUE)
>
> Substitute your data, use beside=FALSE to stack, etc.
Ahh, that simple. I'll fiddle on with that.
Trying to wean the students away from using Excel for all numbers related
work...
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