p.s: since the "data" (Y variable) is very much not normal (also after a log transform)I would consider going with an a-parametric test check: ? wilcox.test (for a non parametric t.test ) OR (for a non parametric simple anova) ?kruskal.test
On Sat, Mar 7, 2009 at 11:51 PM, Tal Galili <tal.gal...@gmail.com> wrote: > Hello friend. > > I believe anova might be a better solution for you. > You might have a look here: > http://www.personality-project.org/r/r.anova.html > > A simple R session that will work for you is: > > # getting the data in: > data1 <- read.table( "enter the path of the file here, look at ?read.table > for exact syntax) > > aov1 <- aov(data ~ gender + disease + genotype ,data = data1) > summary(aov1) > > > If you insist on t.test, here is the way: > t.test(data ~ gender ,data = data1) > t.test(data ~ disease ,data = data1) > t.test(data ~ genotype ,data = data1) > > > Cheers, > Tal > > > > > On Sat, Mar 7, 2009 at 9:23 PM, 1Rnwb <sbpuro...@gmail.com> wrote: > >> >> Dear list, >> >> i am a biologist who needs to do some ttest between disease and non >> disease, >> sex, genotype and the serum levels of proteins on a large number of >> individuals. i have been using excel for a long time but it is very >> tedious >> and time consuming. i am posting the data below and ask your help in >> generating a code to get this analysis done in R. thanks >> >> gender disease genotype data >> M N CC 3.206447188 >> F N CC 8.2 >> M N CC 15.78908629 >> M N CC 21.14311843 >> F N CC 21.48413647 >> M N CC 30.08028842 >> M N CC 30.11455009 >> F N CC 32.41258845 >> F N CT 6622.253065 >> M N CT 6763.6 >> M N CT 7342.023209 >> F N CT 7617.7 >> F N CT 7857.3 >> M N CT 8027.78692 >> F N CT 8755.950438 >> M N CT 9007.7 >> F N CT 9157.76987 >> M N CT 9398.270953 >> F N CT 9710.083037 >> F N CT 9896.887277 >> M N CT 10082.60082 >> F N CT 10137.05244 >> F N CT 10350.76186 >> M N CT 14629.34508 >> F N TT 4.614829254 >> F N TT 5.223593964 >> F N TT 6.7 >> M N TT 6.7 >> M N TT 7.735287229 >> F N TT 13.68084134 >> F N TT 14.5 >> M N TT 15.3 >> M N TT 16.16826703 >> M N TT 19.8 >> M N TT 24.51271254 >> M N TT 29.92459383 >> F N TT 30.3993842 >> M N TT 30.57161207 >> F N TT 30.72031553 >> F N TT 31.8 >> F N TT 34.72409961 >> M N TT 37 >> F N TT 38.94507607 >> M N TT 39.1 >> M N TT 40.9 >> M N TT 41.5 >> F N TT 42.36614019 >> F Y CC 338.2166757 >> M Y CC 345.8711007 >> M Y CC 347.4659528 >> F Y CC 356.3 >> F Y CC 358.4 >> F Y CC 360.184259 >> F Y CC 453.8 >> F Y CC 573.7342373 >> M Y CC 962.1232959 >> F Y CC 1055.9 >> F Y CC 1309.532621 >> F Y CC 2798.6 >> F Y CC 3568.794326 >> M Y CT 1.227348206 >> F Y CT 2.061944986 >> F Y CT 2.245592643 >> M Y CT 2.454696412 >> M Y CT 2.456716738 >> M Y CT 4.318447391 >> M Y CT 4.503098245 >> M Y CT 5.873088452 >> M Y CT 7.106930564 >> F Y CT 7.7 >> M Y CT 10.83537709 >> M Y CT 11.4 >> M Y CT 12.1 >> M Y CT 12.62002743 >> M Y CT 13.6 >> F Y CT 13.7 >> F Y CT 14.35562171 >> F Y CT 15.9 >> F Y TT 986.6755719 >> F Y TT 1206.475083 >> F Y TT 1237.9 >> M Y TT 1254.5 >> F Y TT 1303.6 >> F Y TT 1573.915019 >> M Y TT 1756.8 >> M Y TT 1895 >> M Y TT 2126.766565 >> F Y TT 2149.512866 >> M Y TT 3249.449945 >> F Y TT 6999.3 >> M Y TT 7172.479241 >> M Y TT 8268.909251 >> M Y TT 8544.229671 >> >> -- >> View this message in context: >> http://www.nabble.com/ttest-in-R-tp22390889p22390889.html >> Sent from the R help mailing list archive at Nabble.com. >> >> ______________________________________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide >> http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. >> > > > > -- > ---------------------------------------------- > > > My contact information: > Tal Galili > Phone number: 972-50-3373767 > FaceBook: Tal Galili > My Blogs: > www.talgalili.com > www.biostatistics.co.il > > > -- ---------------------------------------------- My contact information: Tal Galili Phone number: 972-50-3373767 FaceBook: Tal Galili My Blogs: www.talgalili.com www.biostatistics.co.il [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
