Hi list,Could you please help me to explain the following error messages with
't.test' in R Unix 2.1.1? 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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