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View Diary: Why Obama's New Teacher Incentive Pay Will Take Education Backward (254 comments)

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  •  additionally (0+ / 0-)

    from your own source

    When interpreting the results from any of these analyses, it should be borne in mind that private schools constitute a heterogeneous category and may differ from one another as much as they differ from public schools. Public schools also constitute a heterogeneous category. Consequently, an overall comparison of the two types of schools is of modest utility. The more focused comparisons conducted as part of this study may be of greater value. However, interpretations of the results should take into account the variability due to the relatively small sizes of the samples drawn from each category of private school, as well as the possible bias introduced by the differential participation rates across private school categories.

    There are a number of other caveats. First, the conclusions pertain to national estimates. Results based on a survey of schools in a particular jurisdiction may differ. Second, the data are obtained from an observational study rather than a randomized experiment, so the estimated effects should not be interpreted in terms of causal relationships. In particular, private schools are “schools of choice.” Without further information, such as measures of prior achievement, there is no way to determine how patterns of self-selection may have affected the estimates presented. That is, the estimates of the average difference in school mean scores are confounded with average differences in the student populations, which are not fully captured by the selected student characteristics employed in this analysis.
    emphasis mine
    •  I was responding to your generalization (0+ / 0-)

      and in general, it's not true.

      In specific, it certainly can be true. That is, while I choose my daughter's public school over some of my local private choices for various reasons, there's no question that she'd have benefitted dramatically more by going to a school like Sidwell Friends.

      Fry, don't be a hero! It's not covered by our health plan!

      by elfling on Sat Sep 29, 2012 at 11:59:10 PM PDT

      [ Parent ]

      •  but at best (0+ / 0-)

        my generalization according to your study is null and void but at the same time yours is too.

        Being honest with both myself and you, all I have on this topic is my experiences. I have not really if ever looked for any evidence on private vs public but my experiences especially in a public university then a private one was frankly jarring.

        •  At the parent level, the individual school (0+ / 0-)

          is what matters, not whether the particular example is public or private. And there are many factors that go into that decision. I do not fault any parent who chooses a private school for their particular child and neighborhood and situation. I do stress to people that they don't know what a school is like until and unless they go inside and meet actual people who are part of a school.

          At the policy level, there is a theory that privatizing schools per se is an appropriate and successful strategy to make schools better without spending any additional money. This theory, when studied across populations, appears to be false. To the extent that private schools have any advantage, it is when they spend more money, choose the easiest kids to educate, and elect not to educate the the more difficult kids.

          At the policy level, that's where the generalization is in play. And I would say it is a failure. Handing school campuses over to private operators neither saves money nor improves outcomes.

          For our mainline education system, IMHO we are best served by schools that are controlled by community-elected boards and operate as public institutions.

          Fry, don't be a hero! It's not covered by our health plan!

          by elfling on Sun Sep 30, 2012 at 12:42:01 AM PDT

          [ Parent ]

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