[Rasch] Average Threshold Measure in PCM

Matthew Gushta matthew at allinonemove.com
Wed Mar 30 04:02:52 EST 2011


rasch'ers--
interpretation of the threshold resulting from the partial credit model
seems straightforward to me. however, while attempting to not overwhelm my
audience i would like to present and discuss fewer parameters by using the
average threshold ("average measure" in the winsteps IFILE). but how do i
interpret this parameter? does it represent the point on the theta continue
at which subjects have a 50% chance of being above/below the average score?

for example, given an item scored 0-5 there are 5 thresholds (-2,-1,0,1,2)
an average threshold = 0. does this mean that 0 is the theta value
corresponding to an equal chance of scoring above or below 2.5 points on
this item?

thanks!

--matthew
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