[R] tapply confusion

[andyspeak]

Hello
Thankyou for the help.

kruskal.test(Temp, Roof)   is simple but just returns one result for the
whole temperature dataset organised by roof.

I want to compare the Temp data for each Roof in each Month.  So because i
have temperature data on the three roofs for 16 different months then i want
16 separate kruskal.test results.,

How do i do this?

Thanks




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