Hi, Kim-
For starters you might have a look at
?by
?tapply
?aggregate
Ken
On 07/22/11, kimberly sels wrote:> Hi,
>
> I need to calculate the average length of a trait per individual. I am not
> used to working with R so I could use some help.
> The table goes like this:
>
> ind trait
> 1 3.6
> 1 3.8
> 1 3.9
> 1 3.6
> 2 5.5
> 2 5.2
> 3 4.8
> 3 4.5
>
> and so on...
>
> If I type mean(trait) it will give me the average of all the individuals
and
> I need a list of averages per individual.
> Can you help me please?
>
> Kim
>
> [[alternative HTML version deleted]]
>
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