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how to calculate the mean of a group in a table

tornanddesperate 
Just wanted to thank everybody here for their great help. I tried the
"tapply" and it worked brilliantly. By changing its parameters I can easily
compute the values for the other treatments as well. Without help, I
probably would just have despaired.

Have a great time

mat

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Thread (5 messages)

tornanddesperate how to calculate the mean of a group in a table May 7 Pete Brecknock how to calculate the mean of a group in a table May 7 David Winsemius how to calculate the mean of a group in a table May 7 John Kane how to calculate the mean of a group in a table May 8 tornanddesperate how to calculate the mean of a group in a table May 10