Connecting Principal Evaluation to Student Academic Progress

Student Growth Percentiles (SGPs)

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Student Growth Percentile (SGP) Model

What should we know when including student growth percentiles in a

principal’s performance evaluation?

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Student Growth Percentile (SGP) Characteristics

Percentiles express the percentage of students that fall below a certain score SGPs are reported between 1 and 99.

Higher numbers represent higher growth and lower numbers represent lower growth.

Uncorrelated with prior achievement Low achieving students can show high growth.

High achieving students can show low growth.

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99th Percentile

1st Percentile

50th Percentile

What Do Percentiles Mean?

Percentiles express the percentage of students that fall below a certain score

99% of students with a similar achievement history scored lower

50% of students with a similar achievement history scored lower

1% of students with a similar achievement history scored lower

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Student Growth Percentile (SGP) Levels

To help interpret Student Growth Percentiles, the Virginia Department of Education established categorical growth levels of low, moderate, and high. These data are reported with the growth data for your division or school.

Low growth: represents students with SGPs of 1 to 34.

Moderate growth: includes students with SGPs of 35 to 65.

High growth: represents students with SGPs of 66 to 99.

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Moderate HighLow

1 34 35 65 66 99

Student Growth Percentile (SGP) Considerations

Before using the median SGP as 20 percent of a principal’s evaluation, it is important to determine whether sufficient student growth percentile data are available to apply to the evaluation. Minimum requirement for sufficient data are:

• Data from at least 40 students are available, possibly from multiple years;

• Data from students are representative of students in the school; and

• Data from at least two years are available; three years should be reviewed whenever possible.

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Student Growth Percentile (SGP) Considerations

When there are insufficient SGPs to be representative of students in the school, it may still be appropriate to use SGPs as one component of the evaluation of student academic progress but at a lower percentage. In such cases, other validated quantitative measures of growth should be incorporated.

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Options for Using SGP Data in Principal Performance Evaluation

School divisions may consider usingSGP data in principal performanceevaluation by calculating the following:

• Median Student Growth Percentiles; and/or

• Percentages of Low-, Moderate-,and High-growth Scores.

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Decision Rules for SGPs(This is a suggested rubric for school divisions to consider using or adjusting.)

Rating on Standard 7 –

Student Academic Progress

Exemplary Proficient Developing/ Needs

Improvement

Unacceptable

Median Score of SGP*

Median score in high growth range(≥ 66%tile)

Median score in upper portion of moderate- growth range(45–65%tile)

Median score in lower portion of moderate- growth range(35–44%tile)

Median score in low-growth range(≤ 34%tile)

Percentage Distribution of SGP

≥ 50% of SGP scores in the high growth range

≤ 15% in low growth range

70% of SGP scores in moderate to high-growth range

51%-69% of SGP scores in moderate to high-growth range

≤ 50% of SGP scores in moderate to high-growth range

*Recommend using median score when data are representative of the group being tabulated.

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SGP Median* Score

School division aggregates the SGP data at the school level to determine a progress measure (median SGP). The median SGP represents the midpoint in the distribution of student growth percentiles ─ half of students earned higher SGPs and half earned lower SGPs.

* Recommend using median score when data are representative of the group being tabulated; recommend checking for distribution pattern of data before using median score (e.g., bimodal)

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Bimodal Distribution

50th Percentile

16, 18, 22, 27, 32 68, 79, 85, 92, 95

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48th Percentile

Yourtown Elementary School Mathematics Median Score of

48

Applying Decision Rules for SGPs

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Student Growth Percentile Levels

Yourtown Elementary School Mathematics Median SGP Score

of 48

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Moderate HighLow

1 34 35 65 66 99

Decision Rules for SGPs(This is a suggested rubric for school divisions to consider using or adjusting.)

Rating on Standard 7 –

Student Academic Progress

Exemplary Proficient Developing/ Needs

Improvement

Unacceptable

Median Score of SGP*

Median score in high growth range(≥ 66%tile)

Median score in upper portion of moderate-growth range(45–65%tile)

Median score in lower portion of moderate-growth range(35–44%tile)

Median score in low-growth range(≤ 34%tile)

* Recommend using median score when data are representative of the group being tabulated; recommend checking for distribution pattern of data before using median

score (e.g., bimodal)

The Yourtown Elementary School mathematics SGP median score is 48 percent. The rating for this data point would therefore be: _____________Proficient

Median Score

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SGP Low, Moderate, High Growth Scores

School divisions may aggregate the SGP data at the school level to determine growth groupings. Students are classified into low-, moderate-, or high-growth groups.

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Decision Rules for SGPs(This is a suggested rubric for school divisions to consider using or adjusting.)

Rating on Standard 7 –

Student Academic Progress

Exemplary Proficient Developing/ Needs

Improvement

Unacceptable

Percentage Distribution of SGP

≥ 50% of SGP scores in the high growth range

≤ 15% in low growth range

70% of SGP scores in moderate to high-growth range

51%-69% of SGP scores in moderate to high-growth range

≤ 50% of SGP scores in mid- to high-growth range

Low-, Moderate-, and High-Groupings

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SGP High-, Medium-, Low-Groupings Example

SGP Growth Levels (Percentages) SOL Proficiency Levels (Percentages)

Mathematics Low Moderate High Failing Scores

Proficient Scores

Advanced Proficient

Scores

Passing Scores

(Combined Proficient

and Advanced)

Percentage of Total

Students

2010-2011* 26% 36% 31% 9% 30% 61% 91% 100%2011-2012* 22% 40% 35% 28% 56% 16% 72% 100%

Two-Year Average 24% 38% 33% 19% 43% 38% 81% 100%

This table illustrates how data from mathematics assessments for two years may be viewed to support making determinations from SGP data. Total percentages may not always equal 100 percent due to rounding.

Yourtown Elementary School Mathematics SGP Scores

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* Seven percent of SGP data was missing in 2010-2011 and three percent in 2011-2012.

Applying Low-, Moderate-, and High-Growth Decision Rules to SGP Scores

Yourtown Middle School distribution of SGPs for mathematics:

• Low = 24 percent • Moderate = 38 percent • High = 33 percent

Add moderate and high growth38% + 33% = 71%

Apply this result to the decision rules

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Applying Decision Rules for SGPs(This is a suggested rubric for school divisions to consider using or adjusting.)

Rating on Standard 7 –

Student Academic Progress

Exemplary Proficient Developing/ Needs

Improvement

Unacceptable

Percentage Distribution of SGP

≥ 50% of SGP scores in the high growth range

≤ 15% in low growth range

70% of SGP scores in moderate to high-growth range

51%-69% of SGP scores in moderate to high-growth range

≤ 50% of SGP scores in mid- to high-growth range

Yourtown Middle School distribution of SGPs for mathematics:

1. Moderate + High = 71%2. Low = 24%

Rating for Data Point = Proficient

Low, Moderate, and High Groupings

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Final Thoughts on Using Student Growth Percentiles

• Use SGP data when available and appropriate.• Interpret SGP data in light of missing data.• Base final ratings on two or more years of SGP

data, if a final rating is able to be determined.• Use multiple measures of student academic

progress for a summative rating on Standard 7.• Base summative rating for Standard 7 upon

“preponderance of evidence.”

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Questions?