[Rasch] Equating question

Charalambos Kollias chkollias at outlook.com
Sat Aug 24 03:35:33 AEST 2019

Hi Patrick,

IF a new exam is not in the pipeline for a very long time, you may want to think about the following procedure provided you have full access to both examinations :

Step 1: Thoroughly analyse both tests and compare and contrast them in terms of construct, items, scoring, etc. If you can make a valid argument that they are similar (e.g. measuring the same construct, etc.) then move onto the next step.

Step 2: Recruit test takers and have them take both tests (note: test takers to take both tests within a very short timeframe; don’t forget to keep “all other factors equal”).  Then analyse and compare results of test takers on both tests. Don’t forget to collect qualitative data as well.

I hope this helps.

Best wishes,

Charalambos (Harry) Kollias

From: Rasch <rasch-bounces at acer.edu.au> On Behalf Of Patrick Fisher
Sent: 23 August 2019 18:20
To: rasch at acer.edu.au
Subject: [Rasch] Equating question

Hello Fellow Raschies,

I've been presented with an equating issue that I am not certain can be solved without starting from scratch.

There is a certification board that wants to equate the exam of doctoral residents to the board certification exam. There are no common items and no common people. The populations of each exam are distinctly separate.

In my opinion, they should develop a new examination for everyone to take, from the first year resident to the soon-to-retire uber experienced attending. This way they will all be on the same scale.

Thank you all very much!

Kindest regards,

Patrick B. Fisher, MA, President
SportsMeasures, Inc.
DBA CharacterMeasures
DBA Psychometric Consulting Associates
PO Box 1205
Moline, IL 61266-1205
pfisher at SportsMeasures.com<mailto:pfisher at SportsMeasures.com>
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