[R] Question

Bert Gunter gunter.berton at gene.com
Thu Dec 16 20:01:13 CET 2010

... Depends on the sampled population.

If all children under 6, I'd expect it to be quite skew. If all second
graders, I would expect it to be more symmetric. Though, sadly these
days, there's probably a long tail to the right, at least in developed
countries and especially here in the U.S..


On Thu, Dec 16, 2010 at 7:42 AM, csrabak <crabak at acm.org> wrote:
> Em 14/12/2010 12:46, Matthew Rosett escreveu:
>> How do I determine if my data deviate from the normal distribution?
>> The sample size is 1000 (weights of people).
> As others already posted about the Statistical theoretic aspects of it, I
> want to add that weights of people are not normal distributed due
> biological/physical reasons:
> There is a minimum weight an individual below no one can surpass; same for
> maximum.
> Also the probabilities for symmetrical z scores are not the same, etc.
> This lead researchers in the area of anthropometrics to create
> transformations on these distributions in order to be able to use test we're
> are used to with normal distributions.
> See for an example: http://www.jstor.org/pss/2982992.
> --
> Cesar Rabak
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Bert Gunter
Genentech Nonclinical Biostatistics

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