
Post by amin on Dec 17, 2016 9:25:17 GMT
I was doing research to charatrize group of people into four levels ability. I use a partial credit model to analyze data. How to know the probability of each person in category level with ministep software.



Post by Mike Linacre on Dec 18, 2016 8:05:31 GMT
Amin, the ability of each person is shown in Table 18 and PFILE= output file. The probability of each category for each ability level is shown in the GRFILE= output file.



Post by on Dec 18, 2016 9:56:01 GMT
but mr. Mike, the probability of each category from GRFILE = are probabilty for each item not for each person



Post by Mike Linacre on Dec 18, 2016 23:10:20 GMT
Amin, sorry, Winsteps does not report the probability of each category of each item for each person directly. Winsteps does report the probability of each category of each item relative to the item difficulty. So, please (1) compute the relative measure = (person ability  item difficulty) (2) then look up the relative measure in the GRFILE= to obtain the probability of each category for the person on the item.

