[Rasch] Item-Person Map in Winsteps

Juanito Talili talilij at yahoo.com
Sun Jun 12 00:18:27 EST 2011


Dear Mike L,
In the item-person map of the winsteps output (Table 12.2), there are M, S and T markers.  From the help menu of Winsteps, an "M" marker represents the location of the mean measure. "S" markers are 
placed one sample standard deviation away from the mean. "T" markers are placed 
two sample standard deviations away.  What do we mean when we say "sample standard deviation"?  Is that standard deviation of the person/item logits?
Thank you.
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