FITI= item misfit criterion = 2.0

Specifies the minimum t standardized fit value at which items are selected for reporting as misfits. For Table 10, the table of item calibrations in fit order, an item is omitted only if the absolute values of both t standardized fit statistics are less than FITI=, and both mean-square statistics are closer to 1 than (FITI=)/10, and the item point-biserial correlation is positive. The 26 most underfitting items (high mean-squares) and 26 most overfitting items (low mean-squares) are always reported.

 

For Table 11, the diagnosis of misfitting items, all items with a t standardized fit greater than FITI= are reported. Selection is based on the OUTFIT statistic, unless you set OUTFIT=N in which case the INFIT statistic is used. If MNSQ=YES, then selection is based on the mean-square value: 1 + FITI=/10.

 

Example 1: You wish to focus on grossly "noisy" items in Tables 10 and 11.

  FITI=4 an extreme positive value

 

Example 2: You wish to include all items in Tables 10 and 11.

  FITI= 0