tia_tables | R Documentation |

Show simple Classical Test Analysis statistics at item and test level

tia_tables( dataSrc, predicate = NULL, type = c("raw", "averaged", "compared"), max_scores = c("observed", "theoretical"), distractor = FALSE )

`dataSrc` |
a connection to a dexter database, a matrix, or a data.frame with columns: person_id, item_id, item_score |

`predicate` |
An optional expression to subset data, if NULL all data is used |

`type` |
How to present the item level statistics: |

`max_scores` |
use the observed maximum item score or the theoretical maximum item score according to the scoring rules in the database to determine pvalues and maximum scores |

`distractor` |
add a tia for distractors, only useful for selected response (MC) items |

A list containing:

`booklets` |
a data.frame of statistics at booklet level |

`items` |
a data.frame (or list if type='compared') of statistics at item level |

`distractors` |
a data.frame of statistics at the response level (if distractor==TRUE), i.e. rvalue (pvalue for response) and rar (rest-alternative correlation) |

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