False Proxy + False Proxy = Your Life

Inspiration to write can come from a lot of places. For me it comes quite often from Seth Godin‘s blog and a friend who goads me into connecting his work to education.

Today Mr. Godin blogged about false proxy traps. You can check out his blog for details. In a nutshell a false proxy is when a someone measures a component of something that is difficult to measure in order to justify the entire product. Good example: measuring the quality of a police force by how many people are put in jail. This measure would not take into account that a good police force may limit crime by there mere presence or that they are exemplary at solving problems. Crazy example: measuring the power of the Republican Party by watching Fox News exclusively.

Everyone may not agree but the forced high stakes testing required by NCLB is just such a trap. The idea of the testing program is to determine the quality of a school and its staff. Make no mistake about it. These tests, differently labeled in each state, were never meant to test the knowledge of students. The false proxy comes in when we try to take one test, administer it to thousands of students, and then compare them across a wide breadth of cultures, economies, and immeasurable demographics. My guess is that a district’s aggregate PSSA score can just as accurately determine the median income of the school’s coverage area as it can the success of the school. They could also pretty accurately determine the number of parents who attend parent conferences. The first thought would be easy to prove. Take every school and list them from high to low based on aid ratio (market value/personal income) and then make another list and sort them from low to high on district average PSSA score. I’d be willing to bet there is a high degree of comparability. It’s all public knowledge; give it a whirl!

So, I think we have shown pretty accurately that the PSSA is a false proxy for determining the quality of a school. Don’t get me wrong; some teacher’s should find a new career path. But I can compare scores of teacher’s that I work with who have abilities that are across the board in terms of quality instruction and the one’s that have limited skills have students who do just as well as the distinguished teacher’s students.

Second false proxy: The new Pennsylvania teacher evaluation model. This is even simpler. Charlotte Danielson developed this model to assist in improving the quality of teaching. Never, and the company developing the evaluation tool for Pennsylvania has admitted this, did she intend for the rubric to be diminished to a number. Statistically speaking, you can’t take a measure that is qualitative and quantify it. That is, however, what the Pennsylvania Department of Education intends to do. A tool built to determine the strengths and weaknesses of a teacher and guide him or her to being a distinguished educator will be used to measure his or her effectiveness.

Not only will it water all of this high quality information down to a single number but that number will count as 50% of a teacher’s – and eventually an administrator’s – annual evaluation. Throw in that another 15-30% of the annual evaluation will be determined by PSSA scores and you have a conglomeration of false proxies and statistical fallacies. Goog luck! Two years of low scores and poor observations or probably two years of average observations and average PSSA scores and you may be looking for a job – and me too!

 

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2 thoughts on “False Proxy + False Proxy = Your Life

  1. Great post. I didn’t know the meaning of false proxy before this. Very useful term, and AYP and tests are certainly an appropriate example–only by learning about Common Core did it occur to me that AYP is measured for national expectations but it’s determined by a different test in each state! Although perhaps they’re fairly similar since it’s probably less than 5 companies that create all of them. Do you happen to know what company is creating the new PSSAs?

    I haven’t gotten into the teacher evaluation craziness yet but I’m guessing I’ll be drowning in research on it before too long. Thanks for reminding to stay on the ball!

    Also I’m going to do some digging to see if someone has already charted your prediction of the relationship between district’s aggregate PSSA score and median income of the school’s coverage, and if not I’ll do as you say and give it a whirl…

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    • As you can tell I don’t spend a whole lot of time in my dashboard. The PSSA is developed by Data Recognition Corporation with overview by PDE. DRC develos tests for 13 states. your estimate of less than 5 is probably pretty accurate. I would guess 3.

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