| Interface | Description |
|---|---|
| ItemResponseModel |
An item response model describes the relationship between the probability of a score category and person
ability (i.e.
|
| ItemResponseModelWithGradient |
| Class | Description |
|---|---|
| AbstractItemResponseModel | |
| AbstractItemResponseModelWithGradient | |
| Irm3PL |
An implementation of
AbstractItemResponseModel that allows for the three-parameter logistic (3PL) model,
two-parameter logistic (2PL) model, one-parameter logistic (1PL) model, and the Rasch model. |
| Irm4PL |
Four parameter logistic model.
|
| IrmBinary |
This class provides a cleaner interface to the Irm3PL class.
|
| IrmCollection |
This class represents the item response models for an entire test or collection of item response models.
|
| IrmGPCM |
This version of the Generalized Partial Credit Model (GPCM) uses a discrimination
parameter and two or more step parameters.
|
| IrmGPCM2 |
This version of the Generalized Partial Credit Model (GPCM) uses a discrimination
parameter, a difficulty parameter (b), and one or more threshold parameters.
|
| IrmGRM |
Samejima's graded response model.
|
| IrmPCM |
This version of the Partial Credit Model (GPCM) uses a difficulty parameter (b),
and one or more threshold parameters.
|
| IrmPCM2 |
Class that implements the partial credit model.
|
| RaschRatingScaleGroup |
A rating scale group is a set of test items that share the same rating scale structure.
|
| Enum | Description |
|---|---|
| IrmType |