Hi
>
> hi,
>
> i am using R for first time. i am trying to do T-test for a sample set
with
> three variables. i attached my data set as CSV file.
> but when i do "t.test(data$Day.1,data$Day.2,var.equal=T)" i get this
> following error. Can anyone please help e identify the problem.
>
> Error in if (stderr < 10 * .Machine$double.eps * abs(mx)) stop("data are
> essentially constant") :
> missing value where TRUE/FALSE needed
> In addition: Warning message:
> In mean.default(x) : argument is not numeric or logical: returning NA
I think than in this case the error message is self explaining.
> In mean.default(x) : argument is not numeric or logical: returning NA
data$Day.1
is not numeric or logical so it is probably character or date.
look at str(data)
Regards
Petr
>
> Thanking you in advance.
> Deepak
>
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>
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