Hi
[EMAIL PROTECTED] napsal dne 24.01.2008 23:21:05:
> I need to group some subjects according to two
> variables (var1, var2)
>
> I have a data frame that looks something like this:
>
> Subject var1 var2
> 1 400150
> 2 320100
> 3 580600
> 4
Hi
[EMAIL PROTECTED] napsal dne 07.12.2007 10:04:35:
> Hello,
>
> I have a dataframe of say 20 lines with one line per individual. I want
to
> group these 20 individuals
> by length class (eg. of 5cm) and get the mean value of all the other
variables
> (eg VarA and VarB) for each length class
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