Student Growth Percentile

Understanding Alliance CST 2009 and CST 2010 English and Math Growth

Adapted from “Growth Model” by John Schacter, Ph.D.

Information about The College Ready Promise Growth Model

Online webinars: https://thevaanetwork.com

Quick Start Guide

FAQ Sheet

What are Student Growth Percentiles (SGP)?

Student Growth Percentiles (SGP) measure how much a student has learned from one year to the next compared to other students with similar test scores.

In order to better understand SGP, we need to understand a few key terms

Terminology

Scale Score A converted score so all tests with different

question numbers can be compared.Growth

Amount of increase or decrease between scores.Achievement

Scoring in proficient or advanced bands.Median

The middle term or number in a series.

Scaled Score

GrowthGrowth measures performance from one year

to the next.Growth can either increase or decrease.

Far Below Basic

Below Basic

Basic

Proficient

Advanced

600

400

349

299

270

150

310

375

280

345

CST 2009 CST 2010 CST 2009 CST 2010

600

400

349

299

270

150

Advanced

Proficient

Basic

Below Basic

Far Below Basic

7

Achievement

2008 (1037)

2009 (1089)

2010 (1437)

2008 (758)

2009 (947)

2010 (1019)

2008 (343)

2009 (699)

2010 (862)

English 9 English 10 English 11

2833 34 30 27 25 23

31 29

10

1316

1512 17

9

14 15

37

36 32 42

4040

38

36 35

1815 13

10

1414

21

1516

6 3 5 3 7 49

3 5

Advanced Proficient Basic Below Basic Far Below Basic

38% 39%45%

62%

50%46%

32%

42%

54%

44%

50%

45%

55%

68%

58%61%65% 56%

Per

cent

of S

tude

nts

Pro

ficie

nt/A

dvan

ced

Per

cent

of S

tude

nts

Not

Pro

ficie

nt

Median Student Scaled

ScoreAlex 248

Bertha 259Charlie 301Denise 315

Eric 325Francis 340George 370Harriet 400Ignacio 425

In this example, 50% of the students scored higher than Eric and 50% of the students

scored lower than him. Eric is the median.

Key Concepts about Measuring Growth

Growth is distinct from achievement A student can achieve at a low level but grow quickly, and

vice versa

Each student is compared only to their academic peers (students with similar achievement levels)

The comparison base for TCRP is all 2nd to 11th grade students in TCRP and LAUSD

Demographic variables, socio-economic status and initial achievement have virtually no impact on student growth results

Moderate growthLow

GrowthHigh growth

How does SGP show a Student’s Growth?SGP measures the rate of change students make in relation to their academic peers. This rate of change is reported as a percentile from 1 to 99.

Higher percentiles indicate more growth.Lower percentiles indicate less growth.

330

270

299

349

400

Far Below Basic150

Below Basic

Basic

Proficient

Advanced

600

Grade 6 Grade 7

CST

ELA

SC

ALE

SC

OR

EStudent Growth Percentile (SGP)

Score for Elijah

30560%

40%

SGP = 60

Range of students whose beginning scaled score was 305.

270

299

349

400

Far Below Basic150

Below Basic

Basic

Proficient

Advanced

600

Grade 6 Grade 7

CST

ELA

SC

ALE

SC

OR

E

38591%

SGP = 9352 9%

Student Growth Percentile (SGP) Score for Rosa

Range of students whose beginning scaled score was 385.

Reporting SGPs for Teachers

Last name SGPHernandez 21

Bing24

Johnson27

Harrison32

Morales34

Portis47

Jackson55

Stills61

Lund63

Hershberg 74

James81

Andres88

Sims95

• This list is representative for all students of one teacher.

• Note: SGPs are sorted from lowest to highest.

• The point where 50% of students have a higher SGP, and 50% have a lower SGP is the median.

Median SGP for this teacher is 55.

Posttest = CST 2010

Achievement = CST 2010 Proficiency

Pretest = CST 2009

Growth Percentile

= SGP

Teacher SGP Report Sample

Candle and Wick Terms Candle is the overall SGP and median of

the sample. Example: teacher’s class, school-wide.

Wick represents the range of all SGP

scores above and below the median.

Note: The size of the wick varies depending on the sample size and range

above and below the SGP.

0

10

20

30

40

50

60

70

80

90

100

Teac

her 1

Teac

her 2

Teac

her 3

Teac

her 4

Teac

her S

GP

Candle and Wick ReportsGreen candle: SGP and range above 50th percentile.

White candle: SGP above the 50th percentile but range extends above and below.

Gray candle: SGP below the 50th percentile but range extends above and below.

Red candle: SGP and range below the 50th percentile.

Candle and Wick Reports

Common SGP Questions

Would my final SGP be influenced by the achievement level of the students entering

my class?

In other words: Do low performing students grow less? Do middle performing students grow less? Do high performing students grow less?

Short answer: No

Far Below Basic & Growth

Below Basic & Growth

Basic & Growth

Proficient & Growth

Advanced & Growth

How will the Alliance use SGP Data? To evaluate teachers (a component of

teacher effectiveness calculation) Determine the amount of growth made

by students, teachers, and schools Analyze if students are growing enough

to exceed state standards Explore if students grow similarly across

content areas, grade levels, and classrooms