xxIRT (version 1.1.0)

winsteps: Interface to Winsteps

Description

Run a winsteps calibration in R

Usage

winsteps(u, codes = c(0, 1), noprint = TRUE, ws.path = "C:/Winsteps/", prefix = paste("wstmp", as.integer(Sys.Date()), sep = ""), peo.mean = 0, item.mean = NULL, scale = 1, peo.anchor = NULL, item.anchor = NULL, out.vars = NULL)

Arguments

u

a reponse matrix

codes

a vector of valid response values

noprint

TRUE to remove temporary files

ws.path

the winstep installation directory

prefix

a prefix attached to temporarily generated files

peo.mean

the mean of centered person parameters

item.mean

the mean of centered item parameters

scale

the sd of centering variable

peo.anchor

a two-column matrix of anchored person values: index, value

item.anchor

a two-column maxtrix of anchored item values: index, value

out.vars

a vector of variables to be extracted from winstep outputs

Value

a list of theta, b, step parameters

Details

Winsteps is a commerical software pacakge that calibrates Rach-family models. See Winsteps Manual for more detail regarding its syntax and functionality.

Examples

## Not run: 
# u <- gen.rsp(gen.irt(200, 20, a.mu=log(.5882), a.sig=0, c.min=0, c.max=0))
# winsteps(u$rsp)
# ## End(Not run)