Duplication is not always a good thing. Think about it, most of us don’t carry two cell phones. In a world with limited pants-pocket space, two phones would be senseless, right? Ohio’s school report cards have two essentially-the-same achievement components, both of which receive an A-F letter grade. It’s time to toss one of them for parsimony’s sake.
The first, the indicators-met component, is determined by whether 75 percent of a school’s test-takers reach proficiency on the state’s twenty-four assessments (85 percent for eleventh grade). The second, the performance-index component (PI), is a composite score weighted by the proportion of test-takers who attain each of the state’s five achievement levels.
Though the two indicators differ slightly, they produce very similar results for any given school. In other words, if a school gets a low PI letter grade, it is nearly assured that it will receive a low indicators-met grade. The same is true in the reverse—high PI schools will likely get a high indicators-met grade. Here’s the evidence.
Table 1 shows the letter grades of Ohio’s 3,089 schools by indicators met and PI. As you can tell, the grades correspond closely. For example, 99 percent of schools that received...