I have a dataframe with names in the first column and wait times
between decisions in the second column. Since individuals make
multiple decisions, I want the average for each individual. For
example, the data might look like this

name  wtime
jo    1
jo    2
jo    1
jo    3
tim    3  
tim    2
tim    2
ro    1
ro    2
etc.

I'm hoping there is something like

mean(dataname$wtime[name])

which will just create a column with length equal to the number of
different names (levels) and an average wtime for each. So far though,
I haven't had much luck figuring that one out.

Thanks.
Thomas

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