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

Extracts the estimated parameters from 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'
coef(object, ...)
## S3 method for class 'grm'
coef(object, ...)
## S3 method for class 'ltm'
coef(object, standardized = FALSE, prob = FALSE, order = FALSE, ...)
## S3 method for class 'rasch'
coef(object, prob = FALSE, order = FALSE, ...)
## S3 method for class 'tpm'
coef(object, prob = FALSE, order = FALSE, ...)
``` |

`object` |
an object inheriting from either class |

`standardized` |
logical; if |

`prob` |
logical; if |

`order` |
logical; if |

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

The standardization of the factor loadings is useful in order to form a link to the
Underlying Variable approach. In particular, the standardized form of the factor loadings
represents the correlation coefficient between the latent variables and the underlying continuous variables
based on which the dichotomous outcomes arise (see Bartholomew and Knott, 1999, p.87-88 or Bartholomew
*et al.*, 2002, p.191).

The standardized factor loadings are computed only for the linear one- and two-factor models, fitted by `ltm()`

.

A list or a matrix of the estimated parameters for the fitted model.

Dimitris Rizopoulos d.rizopoulos@erasmusmc.nl

Bartholomew, D. and Knott, M. (1999) *Latent Variable Models
and Factor Analysis*, 2nd ed. London: Arnold.

Bartholomew, D., Steel, F., Moustaki, I. and Galbraith, J. (2002)
*The Analysis and Interpretation of Multivariate Data for
Social Scientists*. London: Chapman and Hall.

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