ibga: Extract IBGA results from a "qualint" object
In QualInt: Test for Qualitative Interactions

Description Usage Arguments Details Value Author(s) References See Also Examples

Extract the testing results of IBGA from a "qualint" object. Only available when test = "IBGA". Produce an error signal if test = "LRT".

ibga(x)

`x`	a qualint object

This function extracts the results related with the IBGA graph from a "qualint" object, which is a matrix which contains the estimating and testing information of the treatment effects (see examples). FOr continuous responses, it is the mean difference. For binary responses, it is the risk difference, relative risk or odds ratio. For survival responses, it it hazard ratio.

A numeric matrix depending on scale (see above).

Lixi Yu, Eun-Young Suh, Guohua (James) Pan
Maintainer: Lixi Yu lixi-yu@uiowa.edu

Gail and Simon (1985), Testing for qualitative interactions between treatment effects and patient subsets, Biometrics, 41, 361-372.

Pan and Wolfe (1993), Tests for generalized problems of detecting qualitative interaction, Technical Report No. 526, Department of Statistics, The Ohio State University.

Pan and Wolfe (1997), Test for qualitative interaction of clinical significance, Statistics in Medicine, 16, 1645-1652.

coef.qualint

ynorm <- rnorm(300)
trtment <- sample(c(0, 1), 300, prob = c(0.4, 0.6),
                  replace = TRUE)
subgrp <- sample(c(0, 1, 2), 300, prob = c(1/3, 1/3, 1/3),
                 replace = TRUE)
test1 <- qualint(ynorm, trtment, subgrp)
ibga(test1)