The district's AYP report states that:
"From 2009 to 2010, students in ALAs posted increases in proficient and
advanced 2.1 times greater than the remainder of the District in
Reading and 1.7 times greater in Mathematics."
Does anyone really understand this?
The accompanying chart shows that the "percentage point" increase in reading as 1.6 percentage points in "the rest of the district" and 3.4 percentage points in the ALA's. In msth the increase was 2.7 for "the rest of the district" and 4.5 for ALA's.
These numbers could result for example from the rest of the district proficiency rate in math going from 60% to 62.7% and the ALA's going from 15% to 19.5%. Wouldn't this be pretty much the status quo (nothing to get particularly excited about)?
The "1.7 times greater than" seems to come from dividing the rest of the district percentage of 4.5 by the ALA percentage of 2.7 and rounding the resulting 1.66 up to 1.7. But what if both the rest of the district and the ALA's increased by 3 percentage points? Dividing 3 by 3, would the ALA increase be "one time greater than" the rest of the district increase, and the rest of the district increase be "one time greater than" the ALA increase?