Problems with CREDO’s Charter School Research: Understanding the Issues
Andrew Maul’s rejoinder to CREDO’s response
Contact:
William J. Mathis, (802) 383-0058, wmathis@sover.net
Andrew Maul, (805) 893-7770, amaul@education.ucsb.edu
William J. Mathis, (802) 383-0058, wmathis@sover.net
Andrew Maul, (805) 893-7770, amaul@education.ucsb.edu
URL
for this press release: http://tinyurl.com/p6so45d
BOULDER,
CO (September 28, 2015) – Earlier this summer, the Center for Research on
Education Outcomes (CREDO) published a response to professor Andrew Maul’s
review of CREDO’s Urban Charter School Study. The National Education Policy
Center (NEPC) today released Maul’s reply, in which he thanks CREDO for the
response yet explains, point-by-point, why he stands by the following eight
concerns he had earlier raised about that study:
1.
The nature of the
comparison between charter and traditional public schools in the CREDO studies
is not clear;
2.
The matching variables
used in CREDO’s studies may not be sufficient to support causal conclusions;
3.
Some
lower-performing charter students are systematically excluded from the CREDO
studies;
4.
CREDO’s reasons for the
systematic exclusion of lower-scoring charter students do not address the
potential for bias arising from the exclusion;
5.
The “days of learning”
metric used in the CREDO studies is problematic;
6.
The CREDO studies fail
to provide sufficient information about the criteria for the selection of urban
regions included in the studies;
7.
The CREDO studies
lack an appropriate correction for multiple significance tests; and
8.
The CREDO studies have
trivial effect sizes.
Find
Maul’s original review of CREDO’s urban-charter report and his full
rejoinder here or go to: http://nepc.colorado.edu/thinktank/review-urban-charter-school
The
original CREDO report, and the CREDO response to Maul’s review, are currently
available at the following urls:
Original report:
http://urbancharters.stanford.edu/download/Urban%20Charter%20School%20Study%20Report%20on%2041%20Regions.pdf
Peterson’s Response:
http://credo.stanford.edu/pdfs/CREDOResponsetoMaulandGabor.pdf
Original report:
http://urbancharters.stanford.edu/download/Urban%20Charter%20School%20Study%20Report%20on%2041%20Regions.pdf
Peterson’s Response:
http://credo.stanford.edu/pdfs/CREDOResponsetoMaulandGabor.pdf
The mission of the National
Education Policy Center is to produce and disseminate
high-quality, peer-reviewed research to inform education policy discussions. We
are guided by the belief that the democratic governance of public education is
strengthened when policies are based on sound evidence. NEPC is housed at the
University of Colorado Boulder School of Education.
Please forward this to anyone you think might be interested. You can learn more about NEPC and sign up for publication updates by visiting http://nepc.colorado.edu/. To learn more about the Think Twice think tank review project, visit http://thinktankreview.org.