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Washington State Institute for Public Policy
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National Board for Professional Teaching Standards (NBPTS) certified teachers (for secondary school students)

Pre-K to 12 Education
  Literature review updated March 2018.
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The National Board for Professional Teaching Standards (NBPTS) certification is an advanced teaching credential that complements (and does not replace) state certification. This analysis estimates the effects middle and high school students experience from having been taught by a NBPTS-certified teacher in a math or English Language Arts course.

Teachers earn NBPTS certification upon completion of a one- to five-year assessment process. The assessment process requires applicants to complete one general skills exam and three portfolios demonstrating their teaching ability and content knowledge. Washington State provides an annual salary bonus to NBPTS-certified teachers. Some NBPTS-certified teachers working in qualifying high-poverty schools can also receive an additional annual bonus.

Meta-analysis is a statistical method to combine the results from separate studies on a program, policy, or topic in order to estimate its effect on an outcome. WSIPP systematically evaluates all credible evaluations we can locate on each topic. The outcomes measured are the types of program impacts that were measured in the research literature (for example, crime or educational attainment). Treatment N represents the total number of individuals or units in the treatment group across the included studies.

An effect size (ES) is a standard metric that summarizes the degree to which a program or policy affects a measured outcome. If the effect size is positive, the outcome increases. If the effect size is negative, the outcome decreases.

Adjusted effect sizes are used to calculate the benefits from our benefit cost model. WSIPP may adjust effect sizes based on methodological characteristics of the study. For example, we may adjust effect sizes when a study has a weak research design or when the program developer is involved in the research. The magnitude of these adjustments varies depending on the topic area.

WSIPP may also adjust the second ES measurement. Research shows the magnitude of some effect sizes decrease over time. For those effect sizes, we estimate outcome-based adjustments which we apply between the first time ES is estimated and the second time ES is estimated. We also report the unadjusted effect size to show the effect sizes before any adjustments have been made. More details about these adjustments can be found in our Technical Documentation.

Meta-Analysis of Program Effects
Outcomes measured No. of effect sizes Treatment N Adjusted effect size(ES) and standard error(SE) Unadjusted effect size (random effects model)
ES SE Age ES p-value
Test scores 13 10 284612 0.031 0.006 13 0.031 0.001

Citations Used in the Meta-Analysis

Cavalluzzo, L.C. (2004). Is national board certification an effective signal of teacher quality? Alexandria, VA: The CNA Corporation.

Cavalluzzo, L., Barrow, L., Henderson, S., Mokher, C., Geraghty, T., & Sartain, L. (2014). From large urban to small rural schools: An empirical study of national board certification and teaching effectiveness. CNA Analysis and Solutions.

Chingos, M.M., & Peterson, P.E. (2011). It's easier to pick a good teacher than to train one: Familiar and new results on the correlates of teacher effectiveness. Economics of Education Review, 30(3), 449-465

Clotfelter, C.T., Ladd, H.F., & Vigdor, J.L. (2010). Teacher credentials and student achievement in high school: A cross-subject analysis with student fixed effects. Journal of Human Resources, 45(3), 655-681.

Cowan, J., & Goldhaber, D. (2016). National Board Certification and teacher effectiveness: Evidence from Washington State. Journal of Research on Educational Effectiveness, 9(3), 233-258.

Fisher, S., & Dickenson, T. (2005). A study of the relationship between the national board certification status of teachers and students' achievement: Technical report. Columbia, SC: South Carolina Dept. of Education.

Harris, D.N., & Sass, T.R. (2009). The effects of NBPTS-certified teachers on student achievement. Journal of Policy Analysis and Management, 28(1), 55-80.

Horoi, I., & Bhai, M. (2018). New evidence on national board certification as a signal of teacher quality. Economic Inquiry, 56(2), 1185-1201.