[R] Converting CSV file to numeric and calculate ttest

Thu Sep 3 09:14:26 CEST 2015

dear Pikal , did you receive my last mail ?

On Thu, Sep 3, 2015 at 8:11 AM, PIKAL Petr [via R] <
ml-node+s789695n4711784h3 at n4.nabble.com> wrote:

> Hi
>
> p value of what? How do you know that it should be 0.3?
>
> Your HTML post is mangled and almost unreadable.
>
> Your code is not reproducible, we do not have AT1.csv
>
> AT1 shall be numeric so your reading process is wrong and following
> conversion to numeric shall be umnnecessary if you read your data properly.
>
> Cheers
> Petr
>
> > -----Original Message-----
> > From: R-help [mailto:[hidden email]
> <http:///user/SendEmail.jtp?type=node&node=4711784&i=0>] On Behalf Of
> shawin
> > Sent: Wednesday, September 02, 2015 9:08 PM
> > To: [hidden email]
> <http:///user/SendEmail.jtp?type=node&node=4711784&i=1>
> > Subject: Re: [R] Converting CSV file to numeric and calculate ttest
> >
> > p value should be 0.3
> >
> > On Wed, Sep 2, 2015 at 8:07 PM, Navien [via R] <
> > [hidden email] <http:///user/SendEmail.jtp?type=node&node=4711784&i=2>>
> wrote:
> >
> > > I have a csv file i convert it to numeric value , then i apply t-test
> > > , but t-test result is not correct: please could you guide me. the
> > data :
> > > ID x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12 x13 x14 x15 1367452_at
> > > 9.488404158 9.470895414 9.282433728 9.366707445 9.955383045
> > > 9.640816474 9.606262272 9.329651027 9.434541611 9.473922432
> > > 9.311412966
> > > 9.3154885 9.434977488 9.470895414 9.764258059 1367453_at 8.630629966
> > > 8.55831075 8.788391003 8.576231135 8.671587906
> > > 8.842979993 8.861958856 8.58330436 8.603596508 8.570129609 8.59798922
> > > 8.572686772 8.679751791 8.663950953 8.432875347 1367454_at
> > 9.354748885
> > > 9.367668838 9.259952558 9.421538213 9.554635162
> > > 9.603744578 9.452197983 9.284228877 9.404607878 9.317737979
> > > 9.343115301
> > > 9.310644266 9.27227486 9.360337823 9.44706281 1367455_at 9.944863964
> > > 9.950427516 10.19101759 10.07350804 10.03269879
> > > 10.1307908 10.03487287 9.74609383 9.886379007 9.775472567 10.036596
> > > 9.544738458 9.699611598 9.911962567 9.625804277
> > >           AT1 <-
> > > read.csv("C:/Users/shawin/Desktop/RProgramms/RAdipose/AT1.csv",
> > >  stringsAsFactors=TRUE)
> > >
> > >
> > > str(AT1)
> > > matAT = data.frame(AT1[,-1])
> > > str(matAT)
> > > write.csv(matAT,"matAT.csv",row.names=FALSE)
> > > #convert the csv file to numeric
> > > matAT<-as.matrix(sapply(matAT,as.numeric))
> > > str(matAT)
> > > group<-factor(rep(c("Ob","Ln"),times=c(7,8)))
> > > t.test(matAT[1,]~group)
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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