Description Usage Arguments Details Value Author(s) See Also Examples

computes a test characteristic curve (tcc) from input item parameters

1 | ```
tcc(a, cb, theta, model = "GRM")
``` |

`a` |
a vector of slope parameters |

`cb` |
a matrix of category boundary/threshold parameters |

`theta` |
a grid of theta values |

`model` |
IRT model, either "GRM" or "GPCM" |

Either the graded response model (GRM) or the generalized partial credit model (GPCM) can be specified. The lowest response/score for each item is coded as 0 not 1.

Retruns a vector of tcc values over a theta grid

Seung W. Choi <[email protected]>

1 2 | ```
## Not run: tcc(a,cb,theta,model="GRM")
## Not run: tcc(a,cb,theta,model="GPCM")
``` |

```
Loading required package: mirt
Loading required package: stats4
Loading required package: lattice
Loading required package: rms
Loading required package: Hmisc
Loading required package: survival
Loading required package: Formula
Loading required package: ggplot2
Attaching package: 'Hmisc'
The following objects are masked from 'package:base':
format.pval, units
Loading required package: SparseM
Attaching package: 'SparseM'
The following object is masked from 'package:base':
backsolve
```

lordif documentation built on May 30, 2017, 5:24 a.m.

Embedding an R snippet on your website

Add the following code to your website.

For more information on customizing the embed code, read Embedding Snippets.