deriv: Derivatives
In Karel-Kroeze/MCAT: What the package does (short line)

Description Usage Arguments Details Value

First and second order derivatives of the specified model, for the specified parameters.

1	deriv(theta, items, resp, model = "GPCM", prior = NULL)

`theta`	Person parameter.
`items`	Itembank, see `genItembank`.
`resp`	Response pattern for the Itembank. Note that all items in the itembank need a corresponding response.
`model`	IRT model, see `MCAT`. Defaults to GPCM.
`prior`	Covariance matrix if a prior should be included, `NULL` otherwise. Defaults to `NULL`. # Do we have to do something here for information? I.e. don't sum it?

Details

If sum == TRUE a list containing a matrix of first order derivatives, and a list of matrices holding the second order derivatives per item. otherwise a vector with the sum of first order derivatives and a matrix with the sum of second order derivatives. TODO: <- THIS

Karel-Kroeze/MCAT documentation built on May 8, 2019, 4:50 p.m.