Hi Dennis, Thanks for your reply. Answers are below:

On Thu, Nov 26, 2009 at 4:14 PM, Dennis Murphy <djmuser@gmail.com> wrote:

> Two questions:
>   (1)  Do you want monthly means (averaged over groups), group means
> (averaged over
>           months), overall average, other???
>

I need mean (of nail) for each treatment (trt) at each value of Month (so
its a two-way mean).

  (2) Why do you have month 0 and month 12? That would suggest a 13 month
year (at minimum).

Actually Month column denotes:
Visit at 0th Month, Visit after 1st Month,...,Visit after 12th Month -- so
you can safely treat them as factor with 6 levels.


> Please let me know if you have any further question,
> Thanks,
> Peng
>
> DM
>
> On Thu, Nov 26, 2009 at 1:00 PM, Peng Cai <pengcaimaillist@gmail.com>wrote:
>
>> Hi R Users,
>>
>> I am using following R code to plot a "grouped boxplot". I'm hoping if I
>> can
>> add MEAN to these boxplots. Data is copied below and attached as text
>> file.
>>
>> install.packages("ggplot2")
>> library(ggplot2)
>> dta<-read.table("Sample.txt",header=T)
>> attach(dta)
>> p <- ggplot(dta, aes(factor(month), nail))
>> p + geom_boxplot(aes(fill = factor(trt)))
>>
>> Data:
>> month nail trt
>> 6 7.2 1
>> 12 9.3 1
>> 0 5.8 1
>> 1 6 1
>> 2 6.5 1
>> 3 7 1
>> 6 9.1 1
>> 12 7.9 1
>> 0 3.3 1
>> 1 4.9 1
>> 2 1.4 2
>> 3 2.7 2
>> 6 3.7 2
>> 12 9.4 2
>> 0 3.1 2
>> 1 2.7 2
>> 2 5.4 2
>> 3 8.3 2
>> 6 12.3 2
>> 12 17.7 2
>>
>> Any help would be greatly appreciated,
>>
>> Thanks,
>> Peng
>>
>> ______________________________________________
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>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>
>

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