[Rasch] item pools

Fidelman, Carolyn Carolyn.Fidelman at ed.gov
Sat Jan 28 02:14:25 EST 2012

Hi Dan!

For children in Grades K, 1, 3, 5, 8 you can obtain item level data from the Early Childhood Longitudinal Study at


The n is around 20,000.

What is available publicly already has IRT theta scores for math and you can just download that directly.  However, to get item level data you have to make a request at ecls at ed.gov<mailto:ecls at ed.gov> or use the directions at

Best of luck on this research!


Carolyn G. Fidelman, Ph.D.
Early Childhood and Household Studies, ECICSD, NCES
Rm 9035, 1990 K St. NW | 202-502-7312 | carolyn.fidelman at ed.gov<mailto:carolyn.fidelman at ed.gov>

From: rasch-bounces at acer.edu.au [mailto:rasch-bounces at acer.edu.au] On Behalf Of Robert Hess
Sent: Thursday, January 26, 2012 2:47 PM
To: rasch at acer.edu.au
Subject: Re: [Rasch] item pools

Question, how big a data set are you looking for? I have some extremely large data sets for math achievement scores (old data from school district of over 40,000 students). I probably would have to get their permission before releasing the data (but I don't think that would be a difficulty). Let me know.
Bob Hess
Prof. Emeritus of Measurement & Evaluation in Education
Arizona State University

From: rasch-bounces at acer.edu.au<mailto:rasch-bounces at acer.edu.au> [mailto:rasch-bounces at acer.edu.au]<mailto:[mailto:rasch-bounces at acer.edu.au]> On Behalf Of Dan Kindlon
Sent: Wednesday, January 25, 2012 1:55 PM
To: rasch at acer.edu.au<mailto:rasch at acer.edu.au>
Subject: [Rasch] item pools

I am interested in locating large item pools containing individual responses to achievement or aptitude questions (e.g. math achievement test  data for students in grades 1-3).  Optimally the data set(s) would already include the item difficulties calibrated using the original sample, but that is not a requirement.

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