Description Usage Arguments Value Author(s) References See Also Examples

This function produces the subset of pairs of stimuli for use in an incomplete design.

1 | ```
incomplete.design(x, samp = 1, f = 2, paper = FALSE)
``` |

`x` |
a vector of stimuli |

`samp` |
an integer value specifying the number of forms to sample (for odd number of stimuli) or the number of blocks to sample (for even number of stimuli). The default is |

`f` |
an integer value specifying the number of forms from which the sampling occurs. This is only needed for an odd number of stimuli. The default is |

`paper` |
logical value. If |

A data frame is returned. The data frame includes the first and second stimulus to be presented in each pair of stimuli. It also includes the block number for matrix sampling and the form to which the pair should be assigned.

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

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.

`forms`

, `ross.ordering`

, `matrix.sampling`

, `big.nine`

, `big.eight`

1 2 3 4 5 6 7 8 9 10 11 12 13 14 | ```
## Choose stimuli for an incomplete design for nine stimuli.
## The function will sample 1 form from the 2 created
data(big.nine)
incomplete.design(big.nine, samp = 1, f = 2, paper = TRUE)
## Choose stimuli for an incomplete design for eight stimuli.
## The function will sample 4 blocks from the 7 possible blocks
data(big.eight)
incomplete.design(big.eight, samp = 4)
## Choose stimuli for an incomplete design for 20 stimuli.
## The function will sample 10 blocks from the 19 possible blocks
data(top.twenty)
incomplete.design(top.twenty, samp = 10)
``` |

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