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totalmem
2012 Feb 23
1
perform t.test by rows and columns in data frame
...re metal concentrations were measured. Three sites are located upstream of a mine and three sites are located downstream of the mine. I would like to compare the upstream and downstream metal levels using a t-test.
The data set looks something like this (but with more metals (25) and sites (6):
TotalMetals Mean Site Location
Al 6000 1 us
Sb 0.6 1 us
Ba 150 1 us
Al 6500 2 us
Sb 0.7 2 us
Ba 160 2 us
Al 5600 3 ds
Sb 0.8 3 ds
Ba 180 3 ds
Al 170 4 ds
Sb 0.8 4 ds
Ba 175 4 ds...