Yet economists Dale Ballou and Michael Podgursky identified significant
methodological flaws in this study.
I've written previously about
methodological flaws in these studies, the most important being that researchers compared children who successfully completed the pre-K program and were just entering kindergarten (the program group), with children who were just starting the pre-k program (the control group), adjusting statistically for the age difference in the two groups.
He said that the journal's peer review procedure failed to identify
methodological flaws in the study.
Not exact matches
Researchers supporting co-parenting identified a number of fundamental
methodological flaws of recent
studies that challenge co-parenting of infants and young children: the failure to interview both parents, small and non-representative samples and use of unreliable and invalid measures, and the fact that even these
studies have actually found no significant differences
in child outcomes
in single versus co-parenting families.
A common challenge we found
in our review is that many
studies suffer from serious
methodological flaws.
Many of those evaluations —
in New York City, Dayton, Ohio, and Washington, D.C., as well as
in the states of Florida, Minnesota, and Louisiana — reported a modest increase or neutral impact on student achievement and graduation rates.9 The findings of some of these
studies, however, have more recently been called into question as
methodological flaws were discovered when adding additional years or replicating the
study.10 As a result, recent voucher program evaluations employ more rigorous research methods such as experimental and quasi-experimental designs and refine their use of certain variables.
But as outlined
in a report published this month based on newer data from ISO - NE, ISO - NE's original
study suffered from
methodological and data - based
flaws that render its results erroneous.
«Questions have been raised, according to a February 14, 2005, article
in The Wall Street Journal, about the significance of
methodological flaws and data errors
in your
studies of the historical records of temperatures and climate change.»
Take, for example, the Nov - Dec 2000 issue of Child Development,
in which at least 10 of the 15 empirical
studies published employ one or another of the
methodological features that Nock rejects as «fatal
flaws.»