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R version 2.12.0 Under development (unstable) (2010-04-18 r51761)
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R version 2.12.0 Under development (unstable) (2010-08-14 r52732)
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Copyright (C) 2010 The R Foundation for Statistical Computing
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Copyright (C) 2010 The R Foundation for Statistical Computing
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ISBN 3-900051-07-0
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ISBN 3-900051-07-0
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R is free software and comes with ABSOLUTELY NO WARRANTY.
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R is free software and comes with ABSOLUTELY NO WARRANTY.
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You are welcome to redistribute it under certain conditions.
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You are welcome to redistribute it under certain conditions.
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>
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>
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> ### ** Examples
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> ### ** Examples
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>
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>
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> require(stats)
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> require(stats)
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> ## Student's paired t-test
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> ## Student's paired t-test
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> with(sleep,
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+      t.test(extra[group == 1],
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> t.test(extra ~ group, data = sleep, paired = TRUE)
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+             extra[group == 2], paired = TRUE))
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	Paired t-test
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	Paired t-test
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data:  extra by group
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data:  extra[group == 1] and extra[group == 2]
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t = -4.0621, df = 9, p-value = 0.002833
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t = -4.0621, df = 9, p-value = 0.002833
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alternative hypothesis: true difference in means is not equal to 0
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alternative hypothesis: true difference in means is not equal to 0
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95 percent confidence interval:
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95 percent confidence interval:
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 -2.4598858 -0.7001142
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 -2.4598858 -0.7001142
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sample estimates:
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sample estimates: