[R] Question

[Bert Gunter]

... 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..

Cheers,
Bert

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
467-7374
http://devo.gene.com/groups/devo/depts/ncb/home.shtml