summary.irt.pars {plink}

Summarize Item Parameters/plink Output

Description

This function summarizes the item parameters for a given object. If the object is of class link, the function prints the linking constants

Usage

## S3 method for class 'irt.pars'
summary(object, ..., descrip = FALSE)

## S3 method for class 'sep.pars'
summary(object, ..., descrip = FALSE)

## S3 method for class 'list'
summary(object, ..., descrip = FALSE)

## S3 method for class 'link'
summary(object, ..., descrip = FALSE)

Arguments

object

an R object. See details below

...

further arguments passed to or from other methods

descrip

if TRUE,print descriptive statistics for the item parameters in object.

Details

The method for objects of class irt.pars summarizes the parameters for a single group or multiple groups. If multiple groups are included in the object, parameters will be summarized for each group separately.

The method for objects of class sep.pars summarizes the parameters for a single sep.pars object.

Objects of class list can include any combination of irt.pars or sep.pars objects. The parameters will be summarized for each group separately.

The method for objects of class link prints the linking constants for n-1 groups. If descrip = TRUE, the method summarizes the parameters for all groups separately. The labels are specified in the following manner "group1/group2", meaning the group1 parameters were transformed to the group2 test using the associated constants. The base group is indicated by an asterisk.

Author(s)

Jonathan P. Weeks [e-mail]

References

Weeks, J. P. (2010) plink: An R package for linking mixed-format tests using IRT-based methods. Journal of Statistical Software, 35(12), 1–33. URL http://www.jstatsoft.org/v35/i12/

See Also

as.irt.pars, irt.pars, sep.pars, sep.pars, link