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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Matt:<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>My apologies&#8212;it seems that this
paper documents trouble with the &#8220;science&#8221; part of the VAM process
as you articulated. &nbsp;Nonetheless, I still think the essence of the
argument is in the construct.&nbsp; Until we understand what it is we are
trying to measure when we ask what &#8220;value&#8221; a teacher adds to the
life of a student it will be hard to generate a useful measure.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>-Jon<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

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<p class=section1 style='margin:0in;margin-bottom:.0001pt'><b><font size=2
color=navy face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:navy;font-weight:bold'>__________________________</span></font></b><font
size=2 color=navy face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:navy'> <br>
</span></font><strong><b><font size=2 color=navy face="Times New Roman"><span
style='font-size:10.0pt;color:navy'>Jon S. Twing, Ph.D.</span></font></b></strong><font
size=2 color=navy><span style='font-size:10.0pt;color:navy'>&nbsp;&nbsp;<br>
Executive Vice President<br>
Assessment &amp; Information <br>
<br>
<b><span style='font-weight:bold'>Pearson</span></b>&nbsp;&nbsp;<br>
<u1:Street u2:st="on"><u1:address u2:st="on">2510 North Dodge Street</u1:address></u1:Street><o:p></o:p></span></font></p>

<p class=section1 style='margin:0in;margin-bottom:.0001pt'><u1:place u2:st="on"><u1:City u2:st="on"><font
size=2 color=navy face="Times New Roman"><span style='font-size:10.0pt;
color:navy'>Iowa City</u1:City>, <u1:State u2:st="on">IA</u1:State>&nbsp;<u1:PostalCode u2:st="on">52245-9945</u1:PostalCode>
<u1:country-region u2:st="on"><u1:country-region u2:st="on"></u1:country-region>USA</u1:country-region></u1:place>
<br>
Telephone: 319.339.6407<o:p></o:p></span></font></p>

<p class=section1 style='margin:0in;margin-bottom:.0001pt'><font size=2
color=navy face="Times New Roman"><span style='font-size:10.0pt;color:navy'>Cell:
319.331.6547<br>
Fax: 319.358.4224<br>
<a href="mailto:jon.s.twing@pearson.com" title="mailto:jon.s.twing@pearson.com"><font
face=Verdana><span style='font-family:Verdana'><span
title="mailto:jon.s.twing@pearson.com">jon.s.twing@pearson.com</span></span></font></a>&nbsp;&nbsp;<br>
</span></font><b><font size=2 color=navy face=Verdana><span style='font-size:
10.0pt;font-family:Verdana;color:navy;font-weight:bold'>__________________________<o:p></o:p></span></font></b></p>

<p class=section1 style='margin:0in;margin-bottom:.0001pt'><font size=2
color=navy face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=section1 style='margin:0in;margin-bottom:.0001pt'><font size=1
color=blue face="Trebuchet MS"><span style='font-size:9.0pt;font-family:"Trebuchet MS";
color:blue'><img border=0 width=80 height=22 id="_x0000_i1027"
src="cid:image002.jpg@01CAF14A.ACCFBD90"></span></font><font size=2 color=navy
face=Verdana><span style='font-size:10.0pt;font-family:Verdana;color:navy'><o:p></o:p></span></font></p>

<p class=section1 style='margin:0in;margin-bottom:.0001pt'><font size=3
color=navy face="Times New Roman"><span style='font-size:12.0pt;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Verdana><span style='font-size:
10.0pt;font-family:Verdana;color:navy'><o:p>&nbsp;</o:p></span></font></p>

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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

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face="Times New Roman"><span style='font-size:12.0pt'>

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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
rasch-bounces@acer.edu.au [mailto:rasch-bounces@acer.edu.au] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Schulz, Matt<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, May 10, 2010 2:35 PM<br>
<b><span style='font-weight:bold'>To:</span></b> rasch@acer.edu.au<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Rasch] Value added
models for teacher effectiveness</span></font><o:p></o:p></p>

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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:blue'>Colleagues, &nbsp;<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:blue'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:blue'>Thought I&#8217;d share the following link
with you all.&nbsp; It&#8217;s a paper that is critical of value-added models
for evaluating teachers.&nbsp; The value-added approach came up in a discussion
following Brent Duckor&#8217;s talk at the Rasch SIG meeting last week.&nbsp;
In that discussion, I described papers such as the one in this link.&nbsp; It
was my opinion that value added models are bad statistics, as opposed to the
good measurement work described by Brent.&nbsp;&nbsp; &#8220;Good&#8221;
statistical practice includes, among other things, recognizing the limitations
of one&#8217;s statistics. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:blue'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><a href="http://www.uh.edu/~adkugler/Rothstein.pdf"
title="http://www.uh.edu/~adkugler/Rothstein.pdf">http://www.uh.edu/~adkugler/Rothstein.pdf</a></span></font><font
size=2 color=blue face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:blue'><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:blue'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:blue'>Matt Schulz<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:blue'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=3 color=blue face="Times New Roman"><span
style='font-size:12.0pt;color:blue'><img border=0 width=524 height=143
id="_x0000_i1025" src="cid:image003.jpg@01CAF14A.ACCFBD90" align=baseline></span></font><o:p></o:p></p>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

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