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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. - PowerPoint PPT Presentation
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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