Table 9.2 Item infit-outfit fit plot

If both infit and outfit plots are requested, then a plot of outfit against infit is also produced to assist with the identification of the different patterns of observations they diagnose. For interpretation of fit statistics, see dichotomous and polytomous fit statistics. The letters on the indicate misfitting items in Table 10.1. Numbers are the count of items with that degree of misfit at that location on the plot.

 

      -4   -3   -2   -1    0    1    2    3    4    5    6    7    8    9     

      ---------------------------------------------------------------------   

    6            |                   |                   .                   6

                 |                   |                 .B                     

    5            |                   |              .        A               5

I                |                   |            .                           

T   4            |                   |         .                             4

E                |                   |       .                                

M   3            |                   |    .            C                     3

                 |                   |I .         D                           

I   2  ----------+--------- -U-Q---M-+-------2---------------------------    2

N                |                 . | H          E                           

F   1            |           T  .    J                                       1

I                |       24   2      |                                        

T   0                   453W       K                                         0

                 |     31.3    PO  L |                                        

S  -1            |   2721       N    |                                      -1

T                |  .3ov    V        |                                        

D  -2  ----------+-2gk-w--- ---------+-----------------------------------   -2

               b d                   |                                        

   -3       a   c|                   |                                      -3

       -------------------------------------------------------------------    

      -4   -3   -2   -1    0    1    2    3    4    5    6    7    8    9     

                              ITEM OUTFIT ZSTD