Show simple Classical Test Analysis statistics at item and test level
tia_tables(dataSrc, predicate = NULL, type = c("raw", "averaged",
"compared"))Data source: a dexter project db handle or a data.frame with columns: person_id, item_id, item_score
An optional expression to subset data, if NULL all data is used
How to present the item level statistics: raw for each test booklet
separately, averaged averaged over the test booklet in which the item is included,
with the number of persons as weights, or compared, in which case the pvalues,
correlations with the sum score (rit), and correlations with the rest score (rit) are
shown in separate tables and compared across booklets
A list containing:
a data frame of statistics at test level
a data frame of statistics at item level