dJ: Derviative of J.
In peterhalpin/cirt: Psychometric models of small group collaborations
Description
Usage
Arguments
Value
Description
Computes the derivative of J (for 2PL, second derivative of test info).
Usage
1
dJ(resp, parms, theta)
Arguments
resp
a matrix or data.frame containing the binary item responses with NA for missing responses (used omit missing responses).
parms
a named list or data.frame with elements parms$alpha and parms$beta corresponding to the discrimination and difficulty parameters of the 2PL model, respectively.
theta
the latent trait.
Value
length(theta) vector of derivatives of J.
peterhalpin/cirt documentation built on May 25, 2019, 1:50 a.m.
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Description Usage Arguments Value
Description
Computes the derivative of J (for 2PL, second derivative of test info).
Usage
1 | dJ(resp, parms, theta)
|
Arguments
resp |
a matrix or data.frame containing the binary item responses with |
parms |
a named list or data.frame with elements |
theta |
the latent trait. |
Value
length(theta) vector of derivatives of J.
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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