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...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 -- View this message in context: http://www.nabble.com/t.tests-by-unique-groupes-tp23810917p23810917.html Sent from the R help mailing list archive at Nabble.com.

...9 18 83.0 SB012XSB099 19 114.3 SB099XSB012 20 173.1 SB099XSB012 21 114.3 SB099XSB012 22 58.8 SB099XSB012 23 98.1 SB099XSB012 24 12.8 SB099XSB012 I want to do a t test for DPW values by the 2 different Cross types for each of spl components. Any suggestions? I just got errors till now Thanks, Imri. -- View this message in context: http://r.789695.n4.nabble.com/Multi-t-tests-tp3905075p3905075.html Sent from the R help mailing list archive at Nabble.com.

Hello!!! I'm trying to do multiple ANOVA tests with R (testing the affect off different factors on the same response). As a result I get many ANOVA tables, and I want to extract a list of the "Pr(>F)" from all the tables. Maybe someone have an idea how to do this? Thanks Imri -- View this message in context: http://www.nabble.com/Multiple-ANOVA-tests-tp23518637p23518637.html Sent from the R help mailing list archive at Nabble.com.

...When replying, please edit your Subject line so it is more specific than "Re: Contents of R-help digest..." Today's Topics:   1. Intra-observer reliability (Shreyasee)   2. Re: Constrained fits: y~a+b*x-c*x^2, with a,b,c >=0       (Berwin A Turlach)   3.  Multiple ANOVA tests (Imri)   4..  r-plot (durden10)   5.  Multivariate Transformations (Hollix)   6. Re: Neural Network resource (Tony Breyal)   7. How to write a loop? (Maithili Shiva)   8. How to exclude a column by name? (Zeljko Vrba)   9. Re: How to write a loop? (Linlin Yan)   10. Re: How to exclude a column by name? (...