[R] an error message with 't.test' with R under Unix
Tao Shi
shitao at hotmail.com
Thu Sep 14 00:34:35 CEST 2006
Hi Peter,
Thank you for the reply!
Really sorry for the formating (forgot to change to plain text). Here is basically what I'm talking about:
> R.version
_
platform x86_64-unknown-linux-gnu
arch x86_64
os linux-gnu
system x86_64, linux-gnu
status
major 2
minor 1.1
year 2005
month 06
day 20
language R
> t.test(1:6~rep(1:2,each=3))
Error in terms.formula(formula[-3]) : invalid model formula in ExtractVars
>
Again, I don't see the error in R under Windows (R 2.3.0) or Unix (R2.3.1). Is this the bug you were talking about?
...Tao
----------------------------------------
> To: shitao at hotmail.com
> CC: r-help at stat.math.ethz.ch
> Subject: Re: [R] an error message with 't.test' with R under Unix
> From: p.dalgaard at biostat.ku.dk
> Date: Wed, 13 Sep 2006 23:52:04 +0200
>
> "Tao Shi" <shitao at hotmail.com> writes:
>
> > Hi list,Could you please help me to explain the following error
> messages with 't.test' in R Unix 2.1.1?
>
> This is completely unreadable! However, yes, there was at some point a
> bug where the LHS of model formulas was checked more rigorously than
> need be, using the same rules that apply to the RHS. This fact can be
> found in a recent NEWS file.
>
>
>
> > I don't see it in R under Windows (R 2.3.0) or Unix (R2.3.1). Is it really due to the different R versions?Thanks,...TaoUnix session: (R.2.1.1)========================> R.version _ platform x86_64-unknown-linux-gnuarch x86_64 os linux-gnu system x86_64, linux-gnu status major 2 minor 1.1 year 2005 month 06 day 20 language R > t.test(extra ~ group, data = sleep) Welch Two Sample t-testdata: extra by group t = -1.8608, df = 17.776, p-value = 0.0794alternative hypothesis: true difference in means is not equal to 0 95 percent confidence interval: -3.3654832 0.2054832 sample estimates:mean in group 1 mean in group 2 !
> > 0.75 2.33 > t.test((1:6)~rep(1:2,each=3))Error in terms.formula(formula[-3]) : invalid model formula in ExtractVars> t.test(2^(1:6)~rep(1:2,each=3))Error in terms.formula(formula[-3]) : invalid power in formula> t.test(2^extra ~ group, data = sleep)Error in terms.formula(formula[-3]) : invalid power in formulaUnix session: (R 2.3.1)============================> R.version _ platform x86_64-unknown-linux-gnu arch x86_64 os linux-gnu system x86_64, linux-gnu status major 2 minor 3.1 year 2006 month 06 day 01 svn rev 38247 language R version.string Version 2.3.1 (2006-06-01)> t.test(1:6~rep(1:2,each
> =!
> > 3)) Welch Two Sample t-testdata: 1:6 by rep(1:2, each = 3) t =
> > -3.6742, df = 4, p-value = 0.02131alternative hypothesis: true difference in means is not equal to 0 95 percent confidence interval: -5.266958 -0.733042 sample estimates:mean in group 1 mean in group 2 2 5 Windows session:===========================> R.version _ platform i386-pc-mingw32 arch i386 os mingw32 system i386, mingw32 status major 2 minor 3.0 year 2006 month 04 day 24 svn rev 37909 language R version.string Version 2.3.0 (2006-04-24)> help(t.test)> t.test(extra ~ group, data = sleep) Welch Two Sample t-testdata: extra by group t = -1.8608, df = 17.
> 7!
> > 76, p-value = 0.0794alternative hypothesis: true difference in means is not equal to 0 95 percent confidence interval: -3.3654832 0.2054832 sample estimates:mean in group 1 mean in group 2 0.75 2.33 > t.test(2^extra ~ group, data = sleep) Welch Two Sample t-testdata: 2^extra by group t = -1.6362, df = 10.718, p-value = 0.1308alternative hypothesis: true difference in means is not equal to 0 95 percent confidence interval: -18.641557 2.773344 sample estimates:mean in group 1 mean in group 2 3.448644 11.382751 > t.test(1:6~rep(1:2,each=3)) Welch Two Sample t-testdata: 1:6 by rep(1:2, each = 3) t = -3.6742, df = 4, p-value = 0.02131alternative hypothesis: true difference in means is not equal to 0 95 percent confidence interval: -5.266958 -0.733042 sample estimates:mean in group 1 mean in group 2 2 5
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