Re: [R] ttest in R

From: Tal Galili <tal.galili_at_gmail.com>
Date: Sun, 08 Mar 2009 00:04:17 +0200

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.galili_at_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 <sbpurohit_at_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_at_r-project.org mailing list
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>> 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

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Received on Sat 07 Mar 2009 - 21:07:24 GMT

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