ItemInformationFunc: IIF for 4PLM
In exametrika: Test Theory Analysis and Biclustering
View source: R/04A_IRTbaseFunctions.R
ItemInformationFunc R Documentation
IIF for 4PLM
Description
Item Information Function for 4PLM
Usage
ItemInformationFunc(a = 1, b, c = 0, d = 1, theta)
Arguments
a
slope parameter
b
location parameter
c
lower asymptote parameter
d
upper asymptote parameter
theta
ability parameter
Value
Returns a numeric vector representing the item information at each ability
level theta. The information is calculated based on the first derivative of
the log-likelihood of the 4PL model with respect to theta.
exametrika documentation built on Aug. 21, 2025, 5:27 p.m.
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View source: R/04A_IRTbaseFunctions.R
| ItemInformationFunc | R Documentation |
IIF for 4PLM
Description
Item Information Function for 4PLM
Usage
ItemInformationFunc(a = 1, b, c = 0, d = 1, theta)
Arguments
a |
slope parameter |
b |
location parameter |
c |
lower asymptote parameter |
d |
upper asymptote parameter |
theta |
ability parameter |
Value
Returns a numeric vector representing the item information at each ability level theta. The information is calculated based on the first derivative of the log-likelihood of the 4PL model with respect to theta.
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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