[Rasch] a query on comparability across time

Iasonas Lamprianou liasonas at cytanet.com.cy
Tue Mar 20 01:25:54 AEDT 2018

Hi Tom, this is a god tip! The attached paper shares some similar concepts with the idea suggested by Mike. This email list rocks! Generous people with good ideas! 
Thank you all 

From: "Tom Bramley" <Bramley.T at cambridgeassessment.org.uk> 
To: rasch at acer.edu.au 
Sent: Monday, 19 March, 2018 13:05:29 
Subject: Re: [Rasch] a query on comparability across time 

Hi Iasonas, 

If the tests have cut-scores/grade boundaries set on them (as GCSEs and A levels do in England) then it might be possible to try the ‘similar items’ method suggested in this paper: [ http://www.cambridgeassessment.org.uk/Images/374813-maintaining-test-standards-by-expert-judgement-of-item-difficulty.pdf | 
http://www.cambridgeassessment.org.uk/Images/374813-maintaining-test-standards-by-expert-judgement-of-item-difficulty.pdf ] 

This is based on smoothed empirical item curves rather than the Rasch model. 



From: Rasch [mailto:rasch-bounces at acer.edu.au] On Behalf Of Iasonas Lamprianou 
Sent: 19 March 2018 06:18 
To: rasch at acer.edu.au 
Subject: Re: [Rasch] a query on comparability across time 

Thank you Mike, highly appreciated! 

----- Original Message ----- 
From: "Mike Linacre" < [ mailto:mike at winsteps.com | mike at winsteps.com ] > 
To: [ mailto:rasch at acer.edu.au | rasch at acer.edu.au ] 
Sent: Monday, 19 March, 2018 08:07:26 
Subject: Re: [Rasch] a query on comparability across time 

That's good, Iasonas. 

The items are not the same, but perhaps they are similar enough for 
"virtual equating" to be feasible - 
[ https://www.rasch.org/rmt/rmt193a.htm | https://www.rasch.org/rmt/rmt193a.htm ] 

Mike L. 

On 3/19/2018 2:42 PM, Iasonas Lamprianou wrote: 
> Good morning Mike (it is morning in this part of the word!). 
> I also have access to item-level data (but as I said, it is not possible to use similar items from one year to the next). 
> Thank you so much Mike for your email. 
> Iasonas 

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