StudentsT: Student's T Statistic

In NPC: Nonparametric Combination of Hypothesis Tests

Description

Calculates the T statistic of the difference between treated and control. The result is intended to be used as a test statistic in a permutation test.

Usage

StudentsT(y, tr, tl, ...)

Arguments

y	Response variable (vector)
tr	Treatment variable (vector)
tl	The level of treatment variable (e.g., "treated" or 1) that indicates treated observations
...	Additional arguments (included for compatibility but ignored)

Details

As Chung and Romano (2013) show, using the studentized difference of means as a permutation test statistic yields an asymptotically valid test of the "weak null" of mean equality between groups.

Value

A scalar test statistic

Note

Returns NA if there are any missing values in y or tr.

Author(s)

Devin Caughey <[e-mail]>

References

Chung, E. and Romano, J. P. (2013) Exact and asymptotically robust permutation tests. Annals of Statistics, 41, 484-507.

NPC documentation built on May 2, 2019, 5:07 a.m.