Compute Ideal Number of Forms

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Description

This function will compute the ideal number of forms for a given set or number of stimuli.

Usage

1
forms(x)

Arguments

x

either a vector of stimuli or an integer value

Value

Text is printed to the screen indicating the ideal number of forms.

Author(s)

Andrew Zieffler zief002@umn.edu, Stacy Karl karlx028@umn.edu, and Julio Cabrera cabre031@umn.edu

References

Davison, M. L. Zieffler, A. Cabrera, J. Karl, S. R. and Cohen, H. S. in press Automated Assembly of Optimally Spaced and Balanced Paired Comparisons: Controlling Order Effects. Behavioral Research Methods. DOI 10.3758/s13428-011-0170-0

Cohen, H.S. and Davison, M.L. 1973 Jiffy-Scale: A FORTRAN IV Program for Generating Ross-Ordered Paired Comparisons. Behavioral Science, 18, 1, 76.

Ross, R.T. 1934 Optimimum Orders for the Presentation of Pairs in the Method of Paired Comparisons. Journal of Educational Psychology, 25, 5, 375–382.

Examples

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## Find ideal number of forms for vector of stimuli
data(big.nine)
forms(big.nine)
data(big.eight)
forms(big.eight)
## Find ideal number of forms for number of stimuli
forms(8)