print.eRm {eRm}R Documentation

Methods for extended Rasch models

Description

The summary and plot methods produce LR-tests and goodness-of-fit plots for objects of class Rm, i.e. the Rasch model, the RSM, and the PCM. The remaining methods can be used for any type of eRm-models.

Usage

## S3 method for class 'eRm':
print(x, ...)
## S3 method for class 'Rm':
plot(x,y, ...)
## S3 method for class 'Rm':
summary(object, ...)
## S3 method for class 'eRm':
coef(object, ...)
## S3 method for class 'eRm':
model.matrix(object, ...)
## S3 method for class 'eRm':
vcov(object, ...)

Arguments

object, x, y An object of class eRm or Rm.
... arguments to pass down (ignored).

Details

vcov returns the variance-covariance matrix of the parameter estimates, coef the estimates of the basic parameters, print the value of the log-likelihood and the parameter estimates and their standard errors, model.matrix the design matrix, and summary and plot as described above.

Author(s)

Patrick Mair, Reinhold Hatzinger

Examples

data(X_rasch)
res <- RM(X_rasch)
print(res)
plot(res)
summary(res)
coef(res)
vcov(res)
model.matrix(res)

[Package eRm version 0.3 Index]