fisherInf | R Documentation |
Calculates the expected value of the observed information of the likelihood evaluated at the input value θ.
fisherInf(catObj, theta, item)
catObj |
An object of class |
theta |
A numeric or an integer indicating the potential value for θ |
item |
An integer indicating the index of the question item |
For the dichotomous case, this Fisher's information is equivalent to the observed information.
The function fisherInf
returns a numeric of the expected value of the observed information of the likelihood evaluated at the input value θ.
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
fisherTestInfo
, obsInf
, selectItem
## Loading ltm Cat object data(ltm_cat) ## Store example answers setAnswers(ltm_cat) <- c(1,0,1,0,1, rep(NA, 35)) ## Fisher's information for different items, at ability parameter of 1 fisherInf(ltm_cat, theta = 1, item = 10) fisherInf(ltm_cat, theta = 1, item = 20)
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