20170628 - ESSA Accountability - Idaho

Tried and true methods for looking at student achievement data: PERCENTILES 
http://k12researchidaho.com/essa/essa.html

Percentiles give us performance information across the whole distribution of student scale scores, not just students getting A’s. They let us compare students performing at five different levels. The five percentiles (i.e., scale scores) are:  

90th percentile: High Score (above 90% of the student scale scores)  
75th percentile: High Average Score (above 75% of the scale scores) 
50th percentile: Average Score for Grade Level (above 50% of the scores) 
25th percentile: Low Average Score (above 25% of the scale scores) 
10th percentile: Low Score (above 10% of the student scale scores)  

Also, the 25th to the 75th percentiles include the middle half of students who took the test, and the 50th percentile is the middle of the middle half of students.

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