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Teacher A85th
Percentile
Teacher B7th Percentile
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98% 89% 94% 95%
98% 97% 96% 100%
98% 90%
Algebra 1 Algebra 2 Biology Civics & Economics
English 1 Geometry Math Physical Science
Reading US History
Teacher Credentials
Other Differences
% of DifferencesExplained By:
CMS (2009, 2010)
Percentage of Differences in Teacher EffectivenessUnexplained by Credentials
Percentage of Differences in Teacher Value-Added(Not) Explained by Experience, Advanced Degrees or
National Board Cert.
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46%3%
1% 50%
-90
-45
0
45
90
135
Teac
her E
ffec
tiven
ess
(Day
s Val
ue-A
dded
+/- 1
80)
0 1 2 3 4
Evaluation Score
Correlation of value-added estimate and evaluation rating is .24. Scores of 3 or higher on evaluation indicate that the teacher performed at or above standard.Value-Added estimates above 0 indicate above-average effectiveness.
CMS Teachers (2010), MathCorrelation of Evaluations to Value-Added Teacher Estimates
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Across SchoolsAcross Schools
Wit
hin
Sch
ools
Wit
hin
Sch
ools
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5
10
15
20
25
30
35
40
Prob
abili
ty o
f Hav
ing
Top
25%
VAM
Tea
cher
(%)
2004 2005 2006 2007 2008 2009 2010 2011
*Difference between top and bottom is statistically significant at 5% level
Math: Top and Bottom Quartile Students, Grades 4-8 MathExposure to Top 25% Value-Added Teachers
Bottom Quartile Student Top Quartile Student
** * * *
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51 6580
30 19 31
31 3265
-80-60-40-20
020406080
100
-80-60-40-20
020406080
100
2008 2009 2010
2008 2009 2010
Teacher 1 Teacher 2
Teacher 3
Teac
her E
ffec
t(+
/- 1
80 D
ays In
stru
ctio
n by
Ave
rage
Tea
cher
)
Year (Spring)District percentile across all subjects taught by teacher label each point .
Middle School CTrajectory of Effectiveness for Teachers Just Granted Career Status
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60k
70k
60k
50k50k
40k
30k
80k
Ann
ual T
each
er S
alar
y ($
)
10 20 30 40 50 60 70 80 90100Percentile of Teacher Effectiveness
80k
70k
60k
50k
40k
30k
An
nu
al T
ea
ch
er
Sa
lar
y (
$)
10 20 30 40 50 60 70 80 90100Percentile of Teacher Effectiveness
Relationship of Teacher Salary to Effectiveness
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Get the Measures Right.
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Andy BaxterDirector, Human Capital StrategiesCharlotte-Mecklenburg [email protected]