expectedObsInf | R Documentation |
Calculates the expected information, which is the observed information attained from a specific response set times the probability of that profile occurring.
expectedObsInf(catObj, item)
catObj |
An object of class |
item |
An integer indicating the index of the question item |
The function expectedObsInf
returns a numeric value of the expected information. **Not implemented
for three parameter model for binary data.**
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
,obsInf
, probability
, selectItem
## Loading ltm Cat object data(ltm_cat) ## Store example answers setAnswers(ltm_cat) <- c(1,0,1,0,1, rep(NA, 35)) ## Expected observed information for different items expectedObsInf(ltm_cat, item = 10) expectedObsInf(ltm_cat, item = 20)
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