scan (version 0.40)

rciSC: Reliable change index

Description

CAUTION! This function is still under development and not ready for use! The rciSC function computes three indices of reliable change (Wise, 2004) and corresponding descriptive statistics.

Usage

rciSC(data, dvar, pvar, rel = 0.8, ci = 0.95, graph = FALSE,
  phases = c(1, 2))

Arguments

data

A single-case data frame. See scdf to learn about this format.

dvar

Character string with the name of the dependent variable.

pvar

Character string with the name of the phase variable.

rel

Reliability of the measure, used to compute the standard error. Default is rel = 0.8.

ci

Width of confidence interval as a decimal. Default is ci = 0.95 applying a 95%-confidence interval.

graph

If set TRUE, a box plot of phase A and B scores is displayed. graph = FALSE by default.

phases

A vector of two characters or numbers indicating the two phases that should be compared. E.g., phases = c("A","C") or phases = c(2,4) for comparing the second and the fourth phase. Phases could be combined by providing a list with two elements. E.g., phases = list(A = c(1,3), B = c(2,4)) will compare phases 1 and 3 (as A) against 2 and 4 (as B). Default is phases = c("A","B").

Value

RCI

A list of three RCI calculations (Jacobson et al., Christenden et al., Hageman et al.).

stand.dif

Standardized difference between mean phase A and B scores.

conf

A matrix containing the lower and upper confidence interval boundaries of phases A and B.

conf.percent

Numeric argument from function call (see ci in Arguments section).

reliability

Numeric argument from function call (see Arguments above).

descriptives

A matrix containing descriptive statistics for phases A and B: n, mean, SD, SE.

N

Number of cases.

A

A vector of phase A scores.

B

A vector of phase B scores.

References

Christensen, L., & Mendoza, J. L. (1986). A method of assessing change in a single subject: An alteration of the RC index. Behavior Therapy, 17, 305-308.

Hageman, W. J. J., & Arrindell, W. A. (1993). A further refinement of the reliable change (RC) index by improving the pre-post difference score: Introducing RCID. Behaviour Research and Therapy, 31, 693-700.

Jacobson, N. S., & Truax, P. (1991). Clinical Significance: A statistical approach to defining meaningful change in psychotherapy research. Journal of Consulting and Clinical Psychology, 59, 12-19.

Wise, E. A. (2004). Methods for analyzing psychotherapy outcomes: A review of clinical significance, reliable change, and recommendations for future directions. Journal of Personality Assessment, 82, 50 - 59.

Examples

# NOT RUN {
## Report the RCIs of the first case from the byHeart data and include a graph
rciSC(byHeart2011[1], graph = TRUE)

# }