My data (slength) look like this:
Plant Block Treat Genotype Source MPH
1 1 1 w 05-AZM sp 160 NA
2 2 1 w 12-50 463 NA
3 3 1 w 12-51 sp 150 0.0508982
4 5 1 w 29-42 567 0.9017094
5 6 1 w KNG-KNG 811 NA
6 7 1 w 02-02 1 NA
Treat column has w or d for each Plant(row). I wont to do t.test of
MPH~Treat for each of the genotypes (128 total). I tried :
t.tests<-by(slength, slength[,4], function(x)
t.test(slength[,6]~slength[,3]))
but it is not what I need.
Do you have any ideas?
Thanks
Imri
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