Gary Rubenstein Demonstrates That the NYC ‘Value Added’ Measurements are Insane

Gary Rubenstein has two excellent posts where he analyzes what happened with the New York Public School System’s value-added measurements for teachers, which were just released.

He discovered several very important things:

(1) There is almost no correlation between a teacher’s score in 2009 to that for the following year.

(2) There is almost no correlation between a teacher’s score when teaching math and when teaching reading – to the same kids, the same year, and in the same elementary class.

(3) There is almost no correlation between a teacher’s score when teaching different grade levels of the same subject (i.e., Math 6 versus Math 7, and so on).

In other words, the Value Added Methodology is very close to being a true random number generator — which would be great if we were playing some sort of fantasy role-playing game or a board game like Monopoly or Yahtzee. But it’s an utterly ridiculous way to run a school system and to evaluate teachers.

I highly recommend reading his two blogs on this topic, which are here (for the first part) and here (for the second part).

After you read them, you need to pass the word (email, word of mouth, twitter, Like, facebook, whatever).

We need to kill this value-added mysticism and drive a special wooden stake through its evil, twisted heart.

 

Published in: on February 28, 2012 at 11:49 pm  Comments (4)  
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