summary.rasch {ltm} | R Documentation |
Summary method for rasch objects
Description
Summarizes the fit of a rasch
object.
Usage
summary.rasch(object, robust.se = FALSE, ...)
Arguments
object |
an object inheriting from class rasch . |
robust.se |
logical; if TRUE robust estimation of standard errors is used, based on the sandwich estimator. |
... |
additional argument; currently none is used. |
Value
An object of class summ.rasch
with components,
coefficients |
the estimated coefficients' table. |
Var.betas |
the covariance matrix for the estimated parameters. |
logLik |
the log-likelihood of object . |
AIC |
the AIC for object . |
BIC |
the BIC for object . |
max.sc |
the maximum absolute value of the score vector at convergence. |
conv |
the convergence identifier returned by optim . |
counts |
the counts argument returned by optim . |
call |
the matched call of object . |
control |
the values used in the control argument in the fit of obj . |
nitems |
the number of items in the data set. |
See Also
rasch
Examples
## The Rasch model for the Wirs data:
m <- rasch(Wirs)
summary(m)
## The Rasch model for the Lsat data:
m <- rasch(Lsat)
summary(m)
## The Rasch model for the Abortion data:
m <- rasch(Abortion)
summary(m, TRUE)
[Package
ltm version 0.1-1
Index]