[R] how calculate mean for each group

[Spencer Graves]

Have you considered "aggregate"? 

hope this helps.  spencer graves

szhan at uoguelph.ca wrote:

>Hello, R experts:
>I got data like this:
>group   duplicate   treatment 
>A         Y          5
>A         Y          3
>A         N          6
>B         Y          2
>B         N          4
>B         Y          1
>How to sort the data and calculate the average treatment value for each group 
>in two level of duplicate. Results like this:
>group   duplicate   treatment 
>A         Y          4
>A         N          6
>B         Y          1.5
>B         N          4
>Thank you in advance.
>
>Josh
>
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