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2009 Jul 21
3
how to use a list to create a plot
I issued the following command to obtain the std dev for each month.
psd<-numSummary(Sal, groups=month, statistics=c("sd"))
which resulted in
> psd
sd n NA
1 6.930340 9367 2319
2 7.847003 10827 1008
3 5.962308 12988 404
4