The conditional growth percentile, or CGP, is a student’s percentile rank for growth. If a student’s CGP is 50, this means that the student’s growth was greater than 50 percent of similar students in the NWEA norm group. Students are similar with regard to starting achievement level, grade, subject area, and number of instructional weeks between test events.
A student who demonstrated growth equivalent to that of similar students (that is, equal to the student growth norms) will have a CGP of 50. Growth greater than the norm would result in a percentile rank higher than the 50th percentile, and growth less than the norm would result in a percentile rank lower than the 50th percentile. CGPs range from the 1st to 99th percentile.
CGPs can be compared across grade levels and across subjects, but should not be averaged. This means that, if you have two students who have CGPs of 25 and 75, you can say that the student with a CGP of 75 grew more compared to their norm group than the student with a CGP of 25. However, it would not be valid to say this group of students, on average, has a CGP of 50.
How can you calculate the CGP?
Because both the conditional growth index (CGI) and CGP are readily available in NWEA reports, there is no need to calculate a student’s growth percentile, as was the case in previous years. This metric will already be provided to you.
The CGP is found on the following reports below:
- Achievement Status and Growth Report
- Student Growth Summary Report
- Comprehensive Data File and Combined Data File
See also:
