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After we posted our data analysis, a few readers noticed the 165 schools who saw higher grades because of former state superintendent Tony Bennett’s last-minute tweak to Indiana’s A-F grading system all received A’s and B’s.
“No schools were bumped up to D’s or C’s. How is that possible?” one StateImpact commenter wrote. “Is it just that lower performing schools never earn ‘extra points’ for improvement?”
The answer has to do with the “subscore ceiling”, the scoring guideline it appears Bennett’s staff disregarded in the process of bumping up the grade of a favorite charter school from a C to an A.
Simply speaking, the subscore ceiling does not hinder the grades of schools that received D’s and F’s. Even if state officials left it in place, it would not have hurt these schools’ grades in any way.
Explaining ‘The Ceiling’
YouTube / StateImpact Indiana
Why Is That?
As we’ve explained, state officials designed the subscore ceiling to ensure schools that received A’s were getting high marks in both math and English.
Quick reminder: Schools are graded on a four-point scale for both their math and English ISTEP+ scores. But with the bonus points the state awards for the number of students who meet growth targets, schools can receive a total of six points in either category.
Because the school’s final A-F rating comes from the average of these two subscores, it was theoretically possible for schools to cancel out not-so-good scores in either Math or English with better scores in the other subject.
And therein lies the explanation to why removing the subscore ceiling did not aid any schools that received F’s or D’s: If one of a school’s subscores is good enough to hit the subscore ceiling — even if the other subscore is low, it’s not mathematically possible for that school to receive a D or an F in the first place.
To illustrate this point, we broke out the white board yet again. These are two examples of schools that were helped by lifting the ceiling:
The example on top is an example school with the same scores as Christel House Academy; they’re the same scores we used in this video.The example on the bottom another school that could be helped by lifting the subscore ceiling — but it’s an extreme example that it actually didn’t exist in this year’s grades.
This fictional school, judging from its scale scores, had more than 90 percent of students pass their English ISTEP+ exams — and earned two English bonus points to boot — but had less than 60 percent of its students pass the Math portion of the ISTEP+.
The contrast between the school’s Math and English results is exactly the situation the subscore ceiling is meant to address; remember, the subscore ceiling was supposed to make it harder for this school’s extremely high scores in one subject to cancel out its extremely low scores in the other.
With the subscore ceiling removed, this extreme case school can earn a B. But even with the ceiling in place, the worst grade this school can receive is a C.
Here’s another way to visualize it — these charts illustrate how to calculate school’s final grades with and without the subscore ceiling:
As you may be able to tell, red cells are where school receive A’s; blue cells, B’s; green, C’s; purple, D’s; and teal, F’s.
You’ll notice that it’s a simple matter of averages. And it shows that it’s mathematically impossible to construct an example of a D or F school that would be aided by removing the subscore ceiling.