Is Quantifying Teacher Performance Akin to Flipping A Coin?

Last week, on the way home from school, I tuned into a story on the radio titled: “Seattle Releases First Teacher Ratings Based on Student Performance.” Data is great, but if you paid attention to the elections a few weeks ago, there were two kinds of math going on. Nate Silver’s Five Thirty Eight blog predicted 50/50 states. Karl Rove’s analysis of the data had him flummoxed. The difference was that Rove was emotionally attached, was eager to win, and for some reason his analysis of the same polls was way off. Alternatively, Silver simply plugged numbers into complex algorithms.

Mathematicians have noted that test scores and teacher performance don’t necessarily have a strong correlation, yet an incredible weight and cost is attributed to these standardized tests. Math professor Johh Ewing says, “You might as well look at all the teachers and flip a coin and those that get heads, say, are good, and those that get tails are bad, and it’s not much different from using one year of growth to measure teachers,”

Ewings paper, “Mathematical Intimidation: Driven by Data,” Looks at the potential pitfall of trying to create Value Added Measures to teacher evaluation.

Like the election examples earlier, we often attach a lot of emotion to the data creating a lot of noise. This noise had the potential to lead to bias. When a teacher says, “But I’ve done this for 20 years. I know this works,” it is evident that experience plays an important role. But is there bias involved. During those 20 years, did that teacher ever once control the experiment by not utilizing a particular skill? If so was the result the same, better, worse. Without trying to control for various things, how does one really know if what you do works. Is it just a feeling or is it based on empirical data.

Finally, there are so many things that make a good teacher: relationships with students, high expectations, integrity, care, leadership, collaboration, etc. Yet all of these traits can’t be tested for.

Standardized test scores are a reality and here to stay. As long as graduate schools use test scores as a tool to help with admissions, and undergraduate schools do the same, high schools and middle schools won’t have much of a choice. Elementary schools just follow.

There’s a dark side to this. Children as early as Pre-K are getting tutored in test preparation. Like the qualities of teachers, students have many amazing strengths and skills. However just because they struggle with test taking, potential doors my be closed without even giving the child a chance to show the brilliance that lies within.

And what about those 21st Century Skills – Critical Thinking, Communication, Collaboration, Creativity, etc. Will teachers drop integrating teaching these skills in order to meet the demands of the test scores? I hope not.


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