Reads ConQuest files comprising item analyses generated by the 'itanal' statement.

1 |

`file` |
Character string with the name of the ConQuest item analysis file. |

A data frame with one row per item response category containing the following columns:

`item.nr` |
Number of the item in the analysis |

`item.name` |
Name of the item |

`Label` |
Response category label |

`Score` |
Score of this response category |

`n.valid` |
Total number of students who responded to this item |

`Abs.Freq` |
Number of students who gave this response |

`Rel.Freq` |
Number of students who gave this response as a percentage of the total number of respondents to the item |

`p` |
Percentage of students who answered this item correctly |

`pt.bis` |
Point-biserial for this response |

`t.value` |
T-Value of the significance test whether the point-biserial correlation is different from 0 |

`p.value` |
p-Value of the significance test whether the point-biserial correlation is different from 0 |

`PV1.Avg.1` |
Mean ability of students who gave this response (based on plausible values) |

`PV1.SD.1` |
Standard deviation of ability of students who gave this response (based on plausible values) |

`pbc` |
Item discrimination |

`threshold` |
Item threshold |

`delta` |
Item delta |

If the model is multidimensional, the mean and standard deviation of the ability of students who gave the respective response will be shown for each dimension.

Sebastian Weirich

See pp.193 of Wu, M.L., Adams, R.J., Wilson, M.R., & Haldane, S.A. (2007). *ACER ConQuest Version 2.0. Generalised Item Response Modeling Software*. Camberwell, Victoria: ACER Press.

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