rciSC: Reliable change index
In scan: Single-Case Data Analyses for Single and Multiple Baseline Designs

Description Usage Arguments Value Author(s) References Examples

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.

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

`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")`.

`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.

Juergen Wilbert

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.