1

2

3

4

5

6

Teacher A85th

Percentile

Teacher B7th Percentile

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.

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

9

Across SchoolsAcross Schools

Wit

hin

Sch

ools

Wit

hin

Sch

ools

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

** * * *

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

12

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

13

Get the Measures Right.

Andy BaxterDirector, Human Capital StrategiesCharlotte-Mecklenburg Schoolsandrew.baxter@cms.k12.nc.us980-522-8799