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: [EMAIL PROTECTED]
> CC: r-help@stat.math.ethz.ch
> Subject: Re: [R] an error message with 't.test' with R under Unix
> From: [EMAIL PROTECTED]
> Date: Wed, 13 Sep 2006 23:52:04 +0200
>
> "Tao Shi" <[EMAIL PROTECTED]> 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
> > _________________________________________________________________
> > Use Messenger to talk to your IM friends, even those on Yahoo!
> >
> > 685ee3e858fe
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@stat.math.ethz.ch 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.
> >
>
> --
> O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
> c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
> (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
> ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
_________________________________________________________________
Use Messenger to talk to your IM friends, even those on Yahoo!
______________________________________________
R-help@stat.math.ethz.ch 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.
