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Mon, 31 Oct 2011 18:14:43 +0100 |
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Susan, I am certain this is my fault but I don't understand what you
are saying here - can you have another try? :)
I understand the differene between accuracy and precision, and the
different types of precision.
What I don't understand is this bit:
>
>Now, having reviewed quite a bit of evidence on this topic, NO ONE
>HAS REALLY TESTED PRECISION except for dependability. Dependability
>plagues all assessments. If you assess a baby using any tool
>included your eyeballs only once -- you have not really covered the
>dependability issue -- be it swallows, diapers, behavior, or weight.
>It is dangerous practice not to actively listen to what the mother
>is telling you and follow up.
>
>Embedded in the original article, after four years of contemplating
>the fact that the education in mathematics and statistics is so
>abysmal that even a peer reviewed journal cannot even spot a GLARING
>error such as mistaking what actually was a very poor test of
>accuracy for a test of precision -- I found a very telling one line
>sentence in the original article.
>
>The authors THOUGHT they were testing evaporative water loss.
>Evaporative water loss is basically sweat loss. They actually did
>repeat their measurements of test weighing. They concluded that
>evaporative water loss was unimportant. What they actually
>conducted was a test of precision. The median and the interquartile
>range of the differences between these estimates was ---- get this 1
>g. Now PLEASE tell me how one can conclude that a repeat measure
>with only 1 g of difference even with evaporative water loss is
>IMPRECISE? By their own study results their repeatability was at
>least as good a within 1 g of the original estimate. I have found
>repeatability of eyeballing the volume of milk in a bottle to be off
>by much much more.
thanks!
Heather Welford Neil
NCT bfc, tutor UK, and sadly, literature and languages graduate (in
Italian) and a late comer to science :)
--
http://www.heatherwelford.co.uk
http://heatherwelford.posterous.com
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