ITBS Data Analysis

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ITBS Data Analysis

• Test Score Alphabet Soup
• What is average?
• What to look for when identifying students in
  greatest need.

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Alphabet Soup

• PR- Percentile Rank
• NPR- National Percentile Rank
• S- Stanine
• NS- National Stanine
• NCE- National Curve Equivalent
• GE- Grade Equivalent
• SS- Standard Score

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PR and NPR

• Percentile Rank (PR)
• National Percentile Rank (NPR)
• Both refer to the same thing
• Percentiles are on a scale of 1-99.

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• A percentile score of 50 means that 50 percent
  of students in the nation did better than the
  student.
• A percentile score of 10 means that 90 percent
  of students in the nation did better than the
  student.

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S and NS

• Stanine , National Stanine
• Scale based on 1-9
• Divides the Bell Curve into 9 unequal sections

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NCE Normal Curve Equivalent

• On a scale of 1-99
• Divides the Bell Curve into equal sections

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GE Grade Equivalent

• Reports score in terms of year and month of
  schooling.
• GE does NOT indicate a students instructional
  level.
• GE indicates the level at which the average
  student would score on the same level test.

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• For example
• A 3rd Grade student with a GE of 4.7 scored at
  the same level as the average 4th grader in the
  7th month of school would have scored on the 3rd
  Grade test.
• GE is useful in showing the growth of a student
  over time.

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SS Standard Score

• This score is used as the foundation for
  calculating all other scores.

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Norm-Referenced Test - NRT

• Score compared to other scores

HIGH
LOW
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Criterion-Referenced Test - CRT

• Score compared to a performance standard

Criterion
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What is Average?
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Percentile Rank

• 1-24 Below Average
• 25-75 Average
• 76-99 Above Average

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Stanine

• 1-2-3 Below Average
• 4-5-6 Average
• 7-8-9 Above Average

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Grade Equivalent

• Low student 7 month gain in 1 year
• Fall Grade 6 4.1 GE
• Fall Grade 7 4.8 GE
• Average student 10 month gain in 1 year
• Fall Grade 6 6.2 GE
• Fall Grade 7 7.2 GE
• High Student 12 month gain in 1 year
• Fall Grade 6 8.4 GE
• Fall Grade 7 9.6 GE

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Standard Score

• K 130
• 1st 150
• 2nd 168
• 3rd 185
• 4th 200
• 5th 214
• 6th 227
• 7th 239
• 8th 250
• 9th - 260

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Normal Curve Equivalent

• Growth is the same no matter where on the Bell
  Curve
• 3 NCE reflects significant growth

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Understanding CogAT(Cognitive Abilities Test)

• Verbal Battery
• Predicts Academic Success
• Quantitative Battery
• Appraises Abstract Reasoning
• Non-Verbal Battery
• Assesses Ability to Process Information

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• CogAT is NOT an IQ test
• CogAT
• Tests of Relational Thinking
• Measures the Pattern Development of Learning
  Strategies (How students learn to learn)
• Measures Ability to Make Comparisons and Draw
  Conclusions About Three Levels of Cognitive
  Symbols

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More Alphabet Soup

• SAS Standard Age Score
• PGE Predicted Grade Equivalent
• DIFF Difference between predicted and actual
  score

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What to look for

• ITBS stanine any student scoring 1-4
• Compare Core Total stanine with sub-tests
• Are there any subtests or 2 from Core Total?

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• CogAT Profiles
• A Same (Verbal, Quant., Non-verbal)
• B Above/Below (One score compared to other two)
• C Contrast (one high / one low)
• E Extreme (24 point difference)
• Individual student profiles can be found at
• www.cogat.com

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CogAT Predicted Scores

• Compares ITBS performance with CoGAT

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Item Analysis Report

• Can be used to identify concepts needing more
  instruction
• Teach concepts, not test questions
• Error analysis may identify common misconceptions

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ITBS Other Notes

• 1/3 of the questions on ITBS are recall
• 2/3 of the questions are higher-level thinking
  skills
• The majority of students should finish the test
• Questions are saw-toothed (Easy, hard, easy,
  hard)