irt: irt

In irt: irt. Spady's Item Response Model

Description

irt

Arguments

r	is a vector of ordered outcomes
W	is a matrix of characteristics
thstart	starting values
beta	should beta distribution rather than uniform be taken as base density to be tilted
snpdeg	degree
type	type
nqpoints	nqpoints
qrange	qrange
gradtol	gradtol
iterlim	iterlim

Value

Function returns an object ...

Author(s)

Richard Spady

Examples

# -----------------------------------------
# Example 1. 
# Fast by result may not make sense
data(elections)
attach(elections)
Wx <- cbind(age,agesq.01,black,bornagain)
#res <- irt(r=govtakecarewhocant,W=Wx,iterlim=400)
# summary(res)
detach(elections) 

# -----------------------------------------
# Example 2.
# This computation may take a while (10 min or more... )
data(elections)
attach(elections)

Wx <- cbind(age,agesq.01,black,bornagain,blackbornagain,rel.catholic,rel.nonchr, ed.cat1, ed.cat3,ed.cat4,ed.cat5,income.1,income.3,income.4,income.dk,
parent, hispanic,female)
#res <- irt(r=govtakecarewhocant,W=Wx,iterlim=400)
# summary(res)
detach(elections) 

irt documentation built on May 2, 2019, 4:53 p.m.