Tuesday, May 10, 2016

CCRPI State Percentile Ranks

The Georgia Department of Education released 2015 CCRPI results on May 3. The CCRPI is a great data set for understanding school performance. The state provides detailed school drill-downs here. However, for those who don't have a job that involves combing through CCRPI data, sometimes a single school report lacks context. For example, what is a "good" progress point score? These questions are even more relevant because both the state test and the CCRPI formula changed in 2015.

One way to add this context is to look at how a school's score compares to the rest of the state. As a supplement to the state data views, we made the view below that shows the state percentile rank for each CCRPI component.

Remember that each value is a state percentile, not their actual score. For example, the top result shows that Morningside's three-year average of achievement scores was in the 99th percentile in the state, and their three-year average of progress scores was in the 98th percentile. For more details on CCRPI indicators, see this page (the "General Resources" and "CCRPI Indicators" options on the right are particularly helpful). For more details about the visual, mouse-over the question-mark icon in the top right.

It is also helpful to look at this view in conjunction with other Milestones indicators. One such case is the progress component for elementary schools. The progress indicator only measures growth in 4th and 5th grades. Our view of test scores vs. challenge is a helpful compliment because it better captures the cumulative effect of the first four grades and makes comparisons to similar schools.

Three year averages are shown as the default view because the single-year fluctuations in a school's CCRPI tend to be temporary changes, as opposed to long-term trends. This is demonstrated in the correlation table below. If score changes were indicative of a long-term trend, then scores in adjacent years would be the most correlated. However, the correlation between 2012 and 2015, 0.86, is as high as any other correlation. This suggests that the majority of score changes are actually temporary fluctuations and that a multi-year average provides more information about school performance.

The CCRPI is composed of many different indicators and the data required is complex. In 2015 a few of our schools did not receive full credit due to data reporting problems. These errors were usually worth 1-3 CCRPI points. ANCS Middle and KIPP WAYS did not receive full credit this year for students who completed individual graduation plans and career inventories. Grady High School did not receive credit for the American Literature and Composition scores of students enrolled in AP English.

For more information about 2015 CCRPI results, see the superintendent's blog here, or our 2015 CCRPI data report. Or, let us know if you have questions on twitter.