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

Summarizes the fit of either `grm`

, `ltm`

, `rasch`

or `tpm`

objects.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 | ```
## S3 method for class 'gpcm'
summary(object, robust.se = FALSE, ...)
## S3 method for class 'grm'
summary(object, ...)
## S3 method for class 'ltm'
summary(object, robust.se = FALSE, ...)
## S3 method for class 'rasch'
summary(object, robust.se = FALSE, ...)
## S3 method for class 'tpm'
summary(object, ...)
``` |

`object` |
an object inheriting from either class |

`robust.se` |
logical; if |

`...` |
additional argument; currently none is used. |

An object of either class `summ.gpcm`

, class `summ.grm`

, class `summ.ltm`

or class `summ.rasch`

with components,

`coefficients` |
the estimated coefficients' table. |

`Var.betas` |
the approximate covariance matrix for the estimated parameters; returned only in |

`logLik` |
the log-likelihood of |

`AIC` |
the AIC for |

`BIC` |
the BIC for |

`max.sc` |
the maximum absolute value of the score vector at convergence. |

`conv` |
the convergence identifier returned by |

`counts` |
the |

`call` |
the matched call of |

`ltn.struct` |
a character vector describing the latent structure used in |

`control` |
the values used in the |

`nitems` |
the number of items in the data set; returned only in |

For the parameters that have been constrained, the standard errors and *z*-values are printed as `NA`

.

When the coefficients' estimates are reported under the usual IRT parameterization (i.e., `IRT.param = TRUE`

in the call of either `grm`

, `ltm`

or `rasch`

), their standard errors are calculated using the
Delta method.

Dimitris Rizopoulos [email protected]

1 2 3 4 5 6 7 8 9 |

drizopoulos/ltm documentation built on April 19, 2018, 2:37 a.m.

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