getItemMatrix function

getItemMatrix

generates an item matrix. Useful for

getItemMatrix(responses, itemParams, ...)

Arguments

• responses: a data frame made up of rows of vectors of item responses, one for each case.
• itemParams: a list of item designs (each used in a call to simplef). Must be of same length as responses.
• ...: optional arguments, e.g., perfAdj.

Returns

a data frame.