IRDbelow {SSDforR}R Documentation

Improvement Rate Difference (IRD) calculation

Description

This effect size function will compute the IRD and display a graph in the graph window. The desired improvemment is a decrease in the baseline behavior.

Usage

IRDbelow(behavior, phaseX, v1, v2)

Arguments

behavior

behavior variable

phaseX

phase variable

v1

first phase letter (e.g., "A")

v2

second phase letter (e.g., "B")

Author(s)

Charles Auerbach, PhD Wurzweiler School of Social Work Wendy Zeitlin, PhD Montclair State University

References

Auerbach, Charles, and Zeitlin Wendy. SSD for R: An R Package for Analyzing Single-Subject Data. Oxford University Press, 2014. p62-65, p136

Bloom, M., Fischer, J. & Orme, J.G. (2009). Evaluating practice: Guidelines for the accountable professional (6th ed.). New York: Pearson.

Parker, R. I., Vannest, K. J., & Brown, L. (2009). The improvement rate difference for single-case research. Exceptional Children, 75(2), 135-150. Go to www.ssdanalysis.com for more information.

Examples

cry<-c(3, 4, 2, 5, 3, 4, NA, 2, 2, 3, 2, 1, 2, NA, 2, 2, 1, 2, 1, 0, 0, 0)
pcry<-c("A", "A", "A", "A", "A", "A", NA, "B", "B", "B", "B", "B", "B", 
NA, "B1", "B1", "B1", "B1", "B1", "B1", "B1", "B1")
#IQRbandgraph(cry,pcry,"A","week","amount","Crying")
IRDbelow(cry,pcry,"A","B")

[Package SSDforR version 1.5.34 Index]