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View Diary: Doctors Like Public Option, Especially As A Choice (126 comments)

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  •  you are misusing your p values (1+ / 0-)
    Recommended by:
    wmholt

    yes, the two groups are similar, but you cannot extrapolate voluntary responses to a survey to non-responders, especially with such a low response rate. As I posted elsewhere, the very fact that they responded voluntarily makes the responders different. They may have had stronger views, they may have wanted to express their viewpoints more willingly. It is possible that the non-responders have similar viewpoints, but it may also be that the non-responders were neutral or didn't hold strong or well-defined positions at all.

    This is where statistics can be misunderstood and potentially misused.

    Diversity may be the hardest thing for a society to live with, and perhaps the most dangerous thing for a society to be without - W S Coffin

    by stitchmd on Mon Sep 14, 2009 at 07:57:49 PM PDT

    [ Parent ]

    •  what was the null hypothesis ? (0+ / 0-)
      •  huh? (1+ / 0-)
        Recommended by:
        wmholt

        what, that there was no difference between the groups? That still doesn't answer what I'm talking about. You can't use voluntary responses as a measure of differences between these kinds of groups.

        Diversity may be the hardest thing for a society to live with, and perhaps the most dangerous thing for a society to be without - W S Coffin

        by stitchmd on Mon Sep 14, 2009 at 08:05:32 PM PDT

        [ Parent ]

        •  who hasn't heard of sample bias ? (0+ / 0-)

          p. 19.

          Nonprobability sampling methods are ones for which it is not possible to determine the probabilities of the possible samples. Inferences using such samples have unknown reliability and result in sampling bias. The most common nonprobability sampling methiod is volunteer sampling.

          Agresti, A. and Finlay, B. (2009). Statistical Methods for the Social Sciences .Prentice Hall: Upper Saddle River, NJ.

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