StaffStudentGrowthMeasure fields for aggregate teacher growth data

It looks to me like the field descriptions are written at the student level, where the fields don't translate well to an aggregate / teacher-level conception of a growth estimate

StudentGrowthTargetScore (int, optional)

"The target score that has been set for the group of students as it pertains to their student growth."

StudentGrowthActualScore (int, required)

"The actual score a group of students receives on their student growth assessment"

StudentGrowthMet (boolean, required)

"Identifies if the student has met the student growth target score"

This sounds like it would be something like a prediction of a student's score, their actual test score (which would also be stored elsewhere), and a boolean flag for whether the student met that prediction.

This doesn't translate well to a teacher level conception of a growth estimate, where we would have a growth estimate in some units (defined elsewhere in the table schema, and could be percentiles, standardized estimates, or estimates in units of the outcome test scores).

There also may not be a straightforward way to go between "target" and "actual" scores to compute growth in more involved statistical models, or if the measure is an aggregated student growth percentile. It reads to me as though it reduces growth to a 1 or a 0 with the third field.

I'd propose that we create a field that more generally encompasses "growth estimate" with a definition like "The teacher's growth estimate for a group of students". I'd want this field to not be restricted to integers, because we regularly report growth estimates in standardized units with decimals. This would be clearly marked as the field associated with the standard error / confidence interval field that is also planned.