Description Usage Arguments Details Value See Also Examples
Internal function to evaluate whether the two-way (pairwise) frequencies of items in a matrix are balanced.
1 | pw.eval(items, shown, drows, des)
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items |
The total number of items shown in a tradeoff exercise. |
shown |
The number of items shown in each tradeoff task. |
drows |
The number of rows in the tradeoff design matrix. |
des |
A matrix consisting of the levels-coded tradeoff design. |
Evaluates the two-way (pairwise) frequencies of items in a tradeoff design matrix and returns those frequencies as well as the off-diagonal mean and standard deviation of the frequencies.
This function is called internally by tradeoff.des
.
tbl |
A matrix of the two-way frequencies (pairs of items) in the tradeoff design. |
od.mean |
The mean of the off-diagonal elements in |
od.stdv |
The standard deviation of the off-diagonal elements in |
1 | ## INTERNAL USE ONLY
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