infoFunc {conquestr} | R Documentation |

Calculate test information function, given a vector of item difficulties and a vector of abilities. Returns a data frame that can be easily plotted.

```
infoFunc(
myItems,
myAbilities,
type = "empirical",
minTheta = NA,
maxTheta = NA,
stepTheta = NA
)
```

`myItems` |
A vector of item deltas. |

`myAbilities` |
A vector of person abilities. |

`type` |
A character String. Should the test information be calculated empirically ("empirical" - default) or analytically using moments of distribution ("approx"). |

`minTheta` |
The smallest value of ability PDF to plot. |

`maxTheta` |
The largest value of ability PDF to plot. |

`stepTheta` |
The increment to iterate over the ability PDF. Defaults to 0.01. |

A data frame.

```
myInfo<- infoFunc(runif(10, -2, 3), rnorm(1000, 0, 1))
```

[Package *conquestr* version 0.9.96 Index]