pw.eval {choiceDes} | R Documentation |

## INTERNAL: Evaluate two-way frequencies

### Description

Internal function to evaluate whether the two-way (pairwise) frequencies of items in a matrix are balanced.

### Usage

```
pw.eval(items, shown, drows, des)
```

### Arguments

`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. |

### Details

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`

.

### Value

`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 |

### See Also

`tradeoff.des`

### Examples

```
## INTERNAL USE ONLY
```

[Package

*choiceDes*version 0.9-3 Index]