View source: R/generateHelpers.R
simplep | R Documentation |
returns response probabilities for each reponse category of an item at a given value of theta.
simplep(theta, i_params)
theta |
a scalar value of theta. |
i_params |
an item design matrix that is of size response categories (k) by three. The three columns are:
|
a k x 1 matrix of response probabilities evaluated at theta.
myTheta <- 0
myDelta <- 1.5
a <- 1.5
k <- 3
itemParamX <- seq(0, k-1, 1)
itemParamD <- rep(myDelta, k)
itemParamT <- c(0, -0.5, 0.5)
itemParamA <- rep(a, k)
itemParam <- cbind(itemParamX, itemParamD, itemParamT, itemParamA)
colnames(itemParam)<- c("x", "d", "t", "a")
myProbs <- simplep(myTheta, itemParam)
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