I am conducting a standard setting involve items and raters. I used theYes/No Angoff method. Each rater was asked whether the items can be answered correctly by a borderline students. If this item can be answered correctly by the borderline student, then the rater wrote yes, otherwise, wrote no.
I want to evaluate both item difficulty and rater's severity. Thus, I think the two facet model is suitable for my study and the FACET software was used. My model is specified as follows:
ln(P1 /P0 )=B-D-W-T
P1= the probability of a ˇ¨Yesˇ¨ being rated on item i by panelist j.
P0= the probability of a ˇ§Noˇ¨ being rated on item i by panelist j.
B= panelistˇ¦s view of item difficulty,
D= difficulty of item i,
W= the severity of panelist j
T= difficulty of rating a ˇ§Yesˇ¨ relative to ˇ§Noˇ¨.
However, when I submit this paper, I get the reviewer's comment as follows:
"With two facets you are not really using the many-facet Rasch model but a simple rating scale Rasch model, where people answer to items using either 1 or 0 (i.e. yes at this level they can answer the item correctly or no they cannot answer correctly); this analysis could have been performed with Rasch computer programs such as Winsteps or RUMM, which do not implement the many-facet Rasch model. "
I am wondering whether the Winsteps can perform two facet analysis? In my case, can I still use FACET to conduct my analysis? or I have to use winsteps? Thanks!