SCRT (version 1.0)

assignments: All assignments possibilities

Description

All assignment possibilities for the specified design are enumerated.

Usage

assignments(design, save = "no", MT, limit, starts = file.choose(new = FALSE))

Arguments

design

Type of single-case design: "AB", "ABA", "ABAB", "CRD" (completely randomized design), "RBD" (randomized block design), "ATD" (alternating treatments design), or "MBD"

save

Save the possible assignments to a file (save="yes") or just see them as output in the R console (default: save="no").

MT

Measurement times: number of observations.

limit

For phase designs: minimum number of observations per phase. For alternating treatments designs: maximum number of consecutive administrations of the same condition.

starts

Only for multiple baseline designs: location of the file where the possible start points can be found. Default: a window pops up in which the file can be selected.

Details

When choosing to save the possible assignments to a file, a window will pop up (for multiple baseline designs this is the second pop-up window!!!) to ask where to save them. This location can be an existing file, as well as a new file that can be created by giving a file name and the extension .txt. In this latter case a confirmation is required ("The file does not exist yet. Create the file?"). For multiple baseline designs, when using the default starts argument, first a window pops up in which is asked in what file the possible start points can be found. In this startpoint file, each row should contain all possibilities for one unit, separated by a tab. The rows and columns should not be labeled. For multiple baseline designs, the possible combinations of start points for each unit are returned. For all other designs, the possible sequences of conditions are returned (e.g., "A" "A" "A" "A" "B" "B" "B").

References

Bulte, I., & Onghena, P. (2008). An R package for single-case randomization tests. Behavior Research Methods, 40, 467-478. Bulte, I., & Onghena, P. (2009). Randomization tests for multiple baseline designs: An extension of the SCRT-R package. Behavior Research Methods, 41, 477-485. http://ppw.kuleuven.be/english/research/mesrg

See Also

quantity to calculate the number of assignment possibilities. selectdesign to randomly select one of the assignment possibilities.

Examples

assignments(design = "ABAB", save = "no", MT = 24, limit = 4)