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2017 Aug 14
1
weight in lm
...arch.
I don't see why that page doesn't cite: https://en.wikipedia.org/wiki/Unbiased_estimation_of_standard_deviation
... which had several citations including to Johnson, Kotz and Balakrishnan, v 1, ch 13 sect 8.2. I dug out my copy from the bottom of a large pile of tomes that I had not reshelved and can confirm that the formula is almost (but not quite) the same as appears in print.
JK&M give a formula (p 127) with no derivation or citation:
E[S] = sigma*( 2/n )^(1/2)*Gamma(n/2)/Gamma[ (n-1)/2 ]
Whereas the Wikipedia page citing a 1968 TAS article gives:
E[S] = sigma*( 2/(n-1) )^(1...
2017 Aug 14
0
weight in lm
> On 14 Aug 2017, at 13:43 , Spencer Graves <spencer.graves at effectivedefense.org> wrote:
>
>
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> On 2017-08-14 5:53 AM, peter dalgaard wrote:
>>> On 14 Aug 2017, at 10:13 , Troels Ring <tring at gvdnet.dk> wrote:
>>>
>>> Dear friends - I hope you will accept a naive question on lm: R version 3.4.1, Windows 10
>>>
>>> I
2017 Aug 14
2
weight in lm
On 2017-08-14 5:53 AM, peter dalgaard wrote:
>> On 14 Aug 2017, at 10:13 , Troels Ring <tring at gvdnet.dk> wrote:
>>
>> Dear friends - I hope you will accept a naive question on lm: R version 3.4.1, Windows 10
>>
>> I have 204 "baskets" of three types corresponding to factor F, each of size from 2 to 33 containing measurements, and need to know if the