Sunday, June 16, 2013 at 6:04 AM
Which Teachers Are Doing a Good Job?
Ohio has devised a new statistical approach to answering that question. It’s called “value-added.” For now, it only applies to math and English teachers in 4th through 8th grades. In the table below, we have the scores for 4,200 Ohio teachers who have been through two years of this new grading system.
How Value-Added Works[module align="right" width="half" type="aside"]
This series about valued-added, a new way that Ohio is using to measure whether teachers provide a year’s worth of learning to their students, is the result of a partnership between The Cleveland Plain Dealer and StateImpact Ohio. StateImpact reporters Molly Bloom and Ida Lieszkovszky worked with Plain Dealer reporter Patrick O’Donnell and Plain Dealer data analysis editor Rich Exner to produce these stories.
[/module]The measure looks at how much knowledge a teacher’s students gain in a year, as measured by the students’ scores on the Ohio Achievement Assessments.
That's compared against the knowledge students are expected to gain, based on the past performance of students at similar achievement levels.
The better students do in comparison to their peers, the better their teacher’s score. That differential is assumed to be the teacher’s doing -- the "value" he or she adds in the classroom.
The Ohio Department of Education translates those scores into one of five ratings ranging from Most Effective to Least Effective.
Of course, value-added grades are only one way of looking at teacher performance.
To get a fuller picture of how good a teacher is, it's best to rely on multiple measures, including classroom evaluations conducted by principals and what students and parents think of a teacher.[module align="right" width="half" type="aside"]Value-Added Ratings
(from highest to lowest)
[/module]But value-added is a key part of the new teacher evaluation system Ohio schools are phasing in, and in some districts will soon become part of decisions about how much teachers are paid, where they teach and if they're laid off or fired.
To use this table, type a district, school or teacher's name into the Filter box below.
[spreadsheet key="0Ars3eyO0VAaYdFREeXJ5bV9GNU5meDlpQkM1eWtmSWc" source="" sheet=1 filter=1 paginate=1 sortable=1]
Source: Ohio Department of Education | About the Data
Note: This table shows the value-added ratings for 4-8 grade math and reading teachers who received value-added scores in both 2010-11 and 2011-12.
StateImpact Ohio and The Cleveland Plain Dealer obtained value-added scores and ratings under Ohio’s Public Records Act.
This table shows the value-added performance levels, or ratings, for 4-8 grade math and reading teachers who received value-added scores in both 2010-11 and 2011-12.
A value-added rating translates the numeric value-added score each teacher receives into one of five ratings:
The Ohio Department of Education sets the criteria for each rating label.
For 4-8 grade reading and math teachers, value-added ratings will soon count for a substantial part of their regular job evaluations. But value-added ratings are not an overall measure of teacher quality.
Ohio contracts with a North Carolina-based company called SAS to calculate teachers’ value-added scores. An overview of the model SAS uses can be found here.
The ratings displayed in this table are based on teachers’ composite value-added scores. A composite score takes into account a teacher’s performance over multiple years and in multiple grades. However, it includes data only for subjects for which the teacher has a value-added measure in the current year.
More information about how composite scores are calculated can be found here.
Ohio began calculating teachers’ value-added scores in 2010-11 for a limited number of districts and charter schools and increased the number of districts and schools included each year.
Because of the way value-added has been phased in, this table only includes rating for a fraction of Ohio teachers.
By the start of next school year, the Ohio Department of Education expects all eligible teachers to be included in the value-added program.