datashield.t.test: Runs a student's t-test on non-pooled data

In datashield/dsteststatsclient: Datashield package for various statistical test (Client side)

Description

Performs one and two sample t-tests on vectors of data.

Usage

  datashield.t.test(opals, x, y = NULL, alternative = 1,
    mu = 0, paired = FALSE, var.equal = FALSE,
    conf.level = 0.95)

Arguments

opals	character strings that represent the URL of the servers where the study datasets are stored.
x	a (non-empty) numeric vector of data values
y	an optional (non-empty) numeric vector of data values.
alternative	character string specifying the alternative hypothesis, must be one of "two.sided" (default), "greater" or "less". You can specify just the initial letter.
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 TRUE then the pooled variance is used to estimate the variance otherwise the Welch. (or Satterthwaite) approximation to the degrees of freedom is used.
confidence	level of the interval

Details

Summary statistics are obtained from each of the data sets that are located on the distinct computers/servers. And then grand means and variances are calculated. Those are used for performing t-test.

Value

conf.level coefficients estimates of the parameters of the fitted model

a list containing the following elements:

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

alternative a character string describing the alternative hypothesis

method a character string indicating what type of t-test was performed

Author(s)

Isaeva J.

Examples

## Not run: 
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datashield/dsteststatsclient documentation built on May 14, 2019, 7:52 p.m.