Description Usage Arguments Details Value See Also Examples
View source: R/tests--TTestA.R
Performs one and two sample t-tests based on user supplied summary
information instead of data as in t.test()
.
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mx |
a single number representing the sample mean of x. |
sx |
a single number representing the sample standard deviation of x. |
nx |
a single number representing the sample size of x. |
my |
an optional single number representing the sample mean of y. |
sy |
an optional single number representing the sample standard deviation of y. |
ny |
an optional single number representing the sample size of y. |
alternative |
a character string specifying the alternative hypothesis,
must be one of |
mu |
a number indicating the true value of the mean (or difference in means if you are performing a two sample test). |
paired |
a logical indicating whether you want a paired t-test. |
var.equal |
a logical variable indicating whether to treat the two
variances as being equal. If |
conf.level |
confidence level of the interval. |
... |
further arguments to be passed to or from methods. |
alternative = "greater"
is the alternative that x
has a larger
mean than y
.
If paired
is TRUE
then both mx, sx
and my, sy
must be specified and nx
must be equal to ny
. If
var.equal
is TRUE
then the pooled estimate of the variance is
used. By default, if var.equal
is FALSE
then the variance is
estimated separately for both groups and the Welch modification to the
degrees of freedom is used.
If the input data are effectively constant (compared to the larger of the two means) an error is generated.
A list with class "htest"
containing the following components:
statistic |
the value of the t-statistic. |
parameter |
the degrees of freedom for the t-statistic. |
p.value |
the p-value for the test. |
conf.int |
a confidence interval for the mean appropriate to the specified alternative hypothesis. |
estimate |
the estimated mean or difference in means depending on whether it was a one-sample test or a two-sample test. |
null.value |
the specified hypothesized value of the mean or mean difference depending on whether it was a one-sample test or a two-sample test. |
stderr |
the standard error of the mean (difference), used as denominator in the t-statistic formula. |
alternative |
a character string describing the alternative hypothesis. |
method |
a character string indicating what type of t-test was performed. |
data.name |
a character string giving the name(s) of the data. |
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