MDMA (version 2.0.0)

rci: Reliable change index

Description

rci computes the reliable change index according to Jacobson and Truax (1992).

Usage

rci(x1, x2, rxx)

Value

rci returns a vector of length(x1) with reliable change index scores.

Arguments

x1

prescore.

x2

postscore, same length as x1.

rxx

internal consistency statistic.

Author

Mathijs Deen

References

• Jacobson, N.S., & Truax, P. (1992). Clinical significance: a statistical approach to defining meaningful change in psychotherapy research. Journal of Consulting and Clinical Psychology, 59, 12-19.

Examples

library(MASS)
set.seed(1)
q <- mvrnorm(n=120, mu=c(40, 50), Sigma = matrix(c(56.25,45,45,56.25), ncol = 2), empirical = TRUE)
cbind(q, rci(q[,1], q[,2], .8), rci(q[,1], q[,2], .8) > 1.96)