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--></style></div><div>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! </div><div>Thank you all</div><div>Iasonas</div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>From: </b>"Tom Bramley" <Bramley.T@cambridgeassessment.org.uk><br><b>To: </b>rasch@acer.edu.au<br><b>Sent: </b>Monday, 19 March, 2018 13:05:29<br><b>Subject: </b>Re: [Rasch] a query on comparability across time<br></div><div><br></div><div data-marker="__QUOTED_TEXT__">

    
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<p class="MsoNormal"><span style="font-size: 11.0pt; font-family: 'Calibri','sans-serif'; color: #1f497d;" data-mce-style="font-size: 11.0pt; font-family: 'Calibri','sans-serif'; color: #1f497d;">Hi Iasonas,</span></p>
<p class="MsoNormal"><span style="font-size: 11.0pt; font-family: 'Calibri','sans-serif'; color: #1f497d;" data-mce-style="font-size: 11.0pt; font-family: 'Calibri','sans-serif'; color: #1f497d;">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: <a href="http://www.cambridgeassessment.org.uk/Images/374813-maintaining-test-standards-by-expert-judgement-of-item-difficulty.pdf" target="_blank">
http://www.cambridgeassessment.org.uk/Images/374813-maintaining-test-standards-by-expert-judgement-of-item-difficulty.pdf</a></span></p>
<p class="MsoNormal"><span style="font-size: 11.0pt; font-family: 'Calibri','sans-serif'; color: #1f497d;" data-mce-style="font-size: 11.0pt; font-family: 'Calibri','sans-serif'; color: #1f497d;"> </span></p>
<p class="MsoNormal"><span style="font-size: 11.0pt; font-family: 'Calibri','sans-serif'; color: #1f497d;" data-mce-style="font-size: 11.0pt; font-family: 'Calibri','sans-serif'; color: #1f497d;">This is based on smoothed empirical item curves rather than the Rasch model.</span></p>
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<p class="MsoNormal"><span style="font-size: 11.0pt; font-family: 'Calibri','sans-serif'; color: #1f497d;" data-mce-style="font-size: 11.0pt; font-family: 'Calibri','sans-serif'; color: #1f497d;">Regards,</span></p>
<p class="MsoNormal"><span style="font-size: 11.0pt; font-family: 'Calibri','sans-serif'; color: #1f497d;" data-mce-style="font-size: 11.0pt; font-family: 'Calibri','sans-serif'; color: #1f497d;">Tom.</span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size: 10.0pt; font-family: 'Tahoma','sans-serif';" data-mce-style="font-size: 10.0pt; font-family: 'Tahoma','sans-serif';">From:</span></b><span lang="EN-US" style="font-size: 10.0pt; font-family: 'Tahoma','sans-serif';" data-mce-style="font-size: 10.0pt; font-family: 'Tahoma','sans-serif';"> Rasch [mailto:rasch-bounces@acer.edu.au]
<b>On Behalf Of </b>Iasonas Lamprianou<br>
<b>Sent:</b> 19 March 2018 06:18<br>
<b>To:</b> rasch@acer.edu.au<br>
<b>Subject:</b> Re: [Rasch] a query on comparability across time</span></p>
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<p class="MsoNormal">Thank you Mike, highly appreciated!<br>
<br>
----- Original Message -----<br>
From: "Mike Linacre" <<a href="mailto:mike@winsteps.com" target="_blank">mike@winsteps.com</a>><br>
To: <a href="mailto:rasch@acer.edu.au" target="_blank">rasch@acer.edu.au</a><br>
Sent: Monday, 19 March, 2018 08:07:26<br>
Subject: Re: [Rasch] a query on comparability across time<br>
<br>
That's good, Iasonas.<br>
<br>
The items are not the same, but perhaps they are similar enough for <br>
"virtual equating" to be feasible -<br>
<a href="https://www.rasch.org/rmt/rmt193a.htm" target="_blank">https://www.rasch.org/rmt/rmt193a.htm</a><br>
<br>
Mike L.<br>
<br>
<br>
On 3/19/2018 2:42 PM, Iasonas Lamprianou wrote:<br>
> Good morning Mike (it is morning in this part of the word!).<br>
> 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).<br>
> Thank you so much Mike for your email.<br>
> Iasonas<br>
<br>
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