SSDforR (version 1.1)

Xmrchart: SPC XMR-chart

Description

The X-mR-chart can be use to detect changes within and between phases. Can be used with individual data, but it is not appropriate for group data.

Usage

Xmrchart(behavior, phaseX, v1, bandX, ABxlab, ABylab, ABmain)

Arguments

behavior

behavior variable

phaseX

phase variable

v1

phase bands are based upon in quotation marks (e.g., "A")

bandX

number of standard deviations desired (e.g., 2)

ABxlab

x-axis label in quotation marks (e.g., "week")

ABylab

y-axis label in quotation marks (e.g., "amount")

ABmain

main title for chart in quotation marks (e.g., "X-mR-Chart")

References

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

Orme, J. & Cox, M.E. (2001). Analyzing single-subject design data using statistical proces control charts. Social Work Research, 25(2), 115-127.

} {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")
Xmrchart(cry, pcry, "A", 2, "week", "amount", "X-mR-Chart")