tristanz / OpenIRT (http://people.fas.harvard.edu/~tzajonc/openirt.html)

Bayesian and Maximum Likelihood Estimation of Item Response Theory (IRT) Models

Clone this repository (size: 590.0 KB): HTTPS / SSH
$ hg clone http://bitbucket.org/tristanz/openirt/
View at rev
OpenIRT / Stata /
filename size last modified message
DOS2UNIX.EXE 40.0 KB 3 months ago Added dos2unix.exe
naep.do 6.9 KB 3 months ago Improve help file.
naep_children.dta 89.5 KB 9 months ago Initial commit.
naep_items.dta 1.5 KB 9 months ago Initial commit.
openirt.ado 5.1 KB 5 weeks ago Added int check.
openirt.ini 608 B 9 months ago Initial commit.
openirt.pkg 1.3 KB 8 weeks ago Fixed line feed issue.
openirt.sthlp 9.5 KB 5 weeks ago Got rid of progress bar, didn't work on OSX.
openirt_examples.do 6.7 KB 3 months ago Updated help, examples.
stata.toc 196 B 8 weeks ago Fixed line feed issue.
timss_children.dta 27.2 KB 3 months ago Added slides, TIMSS examples, fixed missing responses.
timss_items.dta 1.7 KB 3 months ago Added slides, TIMSS examples, fixed missing responses.

README

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

OpenIRT v. 1.0 - Bayesian and Maximum Likelihood Estimation of IRT Models.

AUTHOR:

Tristan Zajonc
John F. Kennedy School of Government
Harvard University, Cambridge, MA 02138.
Email: tzajonc@fas.harvard.edu
Web: http://people.fas.harvard.edu/~tzajonc

DESCRIPTION:

OpenIRT estimates 2PL and 3PL Item Response Theory (IRT) models for
dichotomous data. It includes Bayesian MCMC estimation of item parameters
and abilities, and maximum likelihood ability estimates.  The Bayesian
methods include both expected posterior (EAP) and plausible values (PV)
ability and item parameter estimates.

OpenIRT is designed to be flexible. It allows any combination of items,
abilities, and responses to be missing.  For instance, fixed anchor
items can be used to place children and items on a known scale; missing
responses can be used to link multiple overlapping test forms; and known
abilities can be used to calibrate new items and ability parameters.

INSTALLATION:

In Stata:
. net install http://people.fas.harvard.edu/~tzajonc/stata/openirt
. help openirt