expectedPV | R Documentation |
Estimates the expected posterior variance for a respondent's estimated ability parameter for an item yet to be answered based on a respondent's ability parameter estimate from the already-answered items.
expectedPV(catObj, item)
catObj |
An object of class |
item |
An integer indicating the index of the question item |
The function expectedPV
returns a numeric value indicating a respondent's expected posterior variance for an unasked item.
This function is to allow users to access the internal functions of the package. During item selection, all calculations are done in compiled C++
code.
Haley Acevedo, Ryden Butler, Josh W. Cutler, Matt Malis, Jacob M. Montgomery, Tom Wilkinson, Erin Rossiter, Min Hee Seo, Alex Weil
estimateSE
, probability
, selectItem
## Loading ltm Cat object
data(ltm_cat)
## Store example answers
setAnswers(ltm_cat) <- c(1,0,1,0,1, rep(NA, 35))
## Estimate EPV for different unasked items
expectedPV(ltm_cat, item = 10)
expectedPV(ltm_cat, item = 20)
expectedPV(ltm_cat, item = 30)
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