Click amount to donate direct to CounterPunch
  • $25
  • $50
  • $100
  • $500
  • $other
  • use PayPal
HAVE YOUR DONATION DOUBLED!

If you are able to donate $100 or more for our Annual Fund Drive, your donation will be matched by another generous CounterPuncher! These are tough times. Regardless of the political rhetoric bantered about the airwaves, the recession hasn’t ended for most of us. We know that money is tight for many of you. But we also know that tens of thousands of daily readers of CounterPunch depend on us to slice through the smokescreen and tell it like is. Please, donate if you can!

FacebookTwitterGoogle+RedditEmail

Grading Teachers, Failing Kids

by MOSHE ADLER

What would children gain from teachers who have the highest evaluations as measured by the metric that Mayor Rahm Emanuel wants to implement for Chicago’s public school (but not charter school) teachers?  This is precisely what three Columbia and Harvard economists researched in a study that has received wide attention from the media and politicians.  According to the authors’ own interpretation—the sky.  But if you read the study itself—nothing at all.

The study examined the incomes of adults who, as children in the 4th through the 8th grades, had teachers of different “Value Added” scores, with Value Added defined as improvement in the scores of students on standardized tests.  The researchers found that the average wage and salary of a 28 year old who had an excellent teacher was $20,509 in 2010 dollars, $182 higher than the average annual pay of all 28 year olds in the study.

How does this compare to the average salary and wage of a 28 year old in this country? The authors chose not to make the comparison, but we can make it for them.  They excluded from their study people whose income was higher than $100,000. As we shall see, this exclusion is problematic; but to do the comparison we must do the same. The average salary and wage in 2010 of a 28 year old who earned less than $100,000 a year was $29,041, 42% higher than the income of a 28 year old in the Columbia-Harvard study who had an excellent teacher. In other words, even if we accept the spin the authors put on their numbers, having an excellent teacher does not pull people out of poverty.

But tiny as it is, even the gain of $182 a year from having a high “value-added” teacher may not really exist.   First, the exclusion of people with high incomes involved some 4,000 individuals, or 1.2% of the sample. The authors justify it by claiming that such people are outliers. But what if it turned out those high income earners had “bad” teachers? Including them in the study would have completely changed the results. Excluding a large number of the best performers from a study about the effect of teaching seems strange.

But that’s not all.  When the authors examined the incomes of 30 year olds they found no statistically significant result.   Why? In the study the authors explain this by the small number of 30 year olds in their sample.  And in their interviews with the media and in public presentations  the authors do not mention this result at all. Yet the number of 30 year olds in their sample is 61,639, and these are all
students who went to school in the same city.  Is this really a small sample? To gain an appreciation for the size of the sample consider the fact that in order to estimate the unemployment rate that it publishes every month, the Bureau of Labor Statistics relies on a national survey of 60,000 households with an average of 1.95 adults in each. Surely if 120,000 people are a good size sample to study a labor force of 150 million people spread all over the country, a sample of 61,639 is a good size sample to study a population of fewer than 5 million elementary school students who all come from the same school system. By any measure the sample size is not only adequate, it is fantastically huge, and the result is not statistically significant.

The statistically insignificant results for 30 year olds may have been inconvenient for the authors for another reason. An increase of $128 a year is small by any standard, so the authors resorted to estimating a lifetime increase in earnings due to this increase. To do this they assumed that the percentage increase in income, 0.9 of one percent, which they estimated for age 28, holds for each year of a person’s working life. And perhaps this is why the authors chose to ignore the results for the 30 year olds. What their findings actually permit them to claim truthfully is that an excellent teacher increases average annual income by $128 at age 28, and that this effect disappears at age 30. But then there would have been nothing to report.

Does teacher quality matter?  Of course it does, and it should, therefore, be evaluated:  by peers, principals, outside experts, students and parents.  But it cannot be measured, and Mayor Emanuel of Chicago knows it.  Why else would the non-union charter schools be exempted from the same measurement?   The evaluation method the mayor wants to implement is nothing more than a union-busting, pro-privatization trick that is based on partisan economics.

Moshe Adler teaches economics at Columbia University and at the Harry Van Arsdale Center for Labor Studies at Empire State College. He is the author of Economics for the Rest of Us: Debunking the Science That Makes Life Dismal (The New Press, 2010),  which is available in paperback and as  an e-book.

 

More articles by:

Moshe Adler teaches economics at Columbia University and at the Harry Van Arsdale Center for Labor Studies at Empire State College. He is the author of Economics for the Rest of Us: Debunking the Science That Makes Life Dismal (The New Press, 2010),  which is available in paperback and as an e-book and in Chinese (2013) and Korean (2015) editions.

Weekend Edition
October 20, 2017
Friday - Sunday
John Pilger
Clinton, Assange and the War on Truth
Michael Hudson
Socialism, Land and Banking: 2017 compared to 1917
Jeffrey St. Clair
A Day in the Life of CounterPunch
Paul Street
The Not-So-Radical “Socialist” From Vermont
Jason Hirthler
Censorship in the Digital Age
Jonathan Cook
Harvey Weinstein and the Politics of Hollywood
Andrew Levine
Diagnosing the Donald
Michelle Renee Matisons
Relocated Puerto Rican Families are Florida’s Latest Class War Targets
Richard Moser
Goldman Sachs vs. Goldman Sachs?
David Rosen
Male Sexual Violence: As American as Cherry Pie
Mike Whitney
John Brennan’s Police State USA
Robert Hunziker
Mr. Toxicity Zaps America
Peter Gelderloos
Catalan Independence and the Crisis of Democracy
Robert Fantina
Fatah, Hamas, Israel and the United States
Edward Curtin
Organized Chaos and Confusion as Political Control
Patrick Cockburn
The Transformation of Iraq: Kurds Have Lost 40% of Their Territory
CJ Hopkins
Tomorrow Belongs to the Corporatocracy
Bill Quigley
The Blueprint for the Most Radical City on the Planet
Brian Cloughley
Chinese Dreams and American Deaths in Africa
John Hultgren
Immigration and the American Political Imagination
Thomas Klikauer
Torturing the Poor, German-Style
Gerry Brown
China’s Elderly Statesmen
Pepe Escobar
Kirkuk Redux Was a Bloodless Offensive, Here’s Why
Jill Richardson
The Mundaneness of Sexual Violence
Caoimhghin Ó Croidheáin
The Choreography of Human Dignity: Blade Runner 2049 and World War Z
Missy Comley Beattie
Bitch, Get Out!!
Andre Vltchek
The Greatest Indonesian Painter and “Praying to the Pig”
Ralph Nader
Why is Nobelist Economist Richard Thaler so Jovial?
Ricardo Vaz
Venezuela Regional Elections: Chavismo in Triumph, Opposition in Disarray and Media in Denial
Kevin Zeese - Margaret Flowers
NAFTA Talks Falter, Time To Increase Pressure
GD Dess
Why We Shouldn’t Let Hillary Haunt Us … And Why Having a Vision Matters
Ron Jacobs
Stop the Idiocy! Stop the Mattis-ness!
Russell Mokhiber
Talley Sergent Aaron Scheinberg Coca Cola Single Payer and the Failure of Democrats in West Virginia
Michael Barker
The Fiction of Kurt Andersen’s “Fantasyland”
Murray Dobbin
Yes, We Need to Tax the Rich
Dave Lindorff
Two Soviet Spies Who Deserve a Posthumous Nobel Peace Prize
Rafael Bernabe – Manuel Rodríguez Banchs
Open Letter to the People of the United States From Puerto Rico, a Month After Hurricane María
Oliver Tickell
#FreeJackLetts
Victor Grossman
From Jamaica to Knees
Michael Welton
Faith and the World: the Baha’i Vision
Barbara Nimri Aziz
Kirkuk the Consolation Prize?
Graham Peebles
Beyond Neo-Liberal Consumerism
Louis Proyect
On Gowans on Syria
Charles R. Larson
Review: Candida R. Moss and Joel S. Baden’s “Bible Nation: the United States of Hobby Lobby”
David Yearsley
Katy Perry’s Gastro-Pop, Gastro-Porn Orgy
FacebookTwitterGoogle+RedditEmail