On 10.02.2023, at 09:22, Dang Ngoc Chan, Christophe <christophe.d...@sidel.com>
wrote:
>
> Hello Heinz,
>
>> De : Heinz Nabielek <heinznabie...@gmail.com>
>> Envoyé : jeudi 9 février 2023 13:36
>>
>> Result is then
>> [...]
>>
>> However, EXCEL conf=0.95 gives me:
>> [...]
>
> Sorry, I don't know particularly the chi-square distribution, I suppose you
> don't ask the same question to both softwares.
>
> If you use for XL
>
> Xmax=CHIINV((1-conf)/2,2*(n+1))/2
>
> Then for Scilab, you should use
>
> N = 1:5
>
> P = (1 - 0.5*0.05)*ones(n)
>
> Q = 1 - P
>
> [Xmax] = 0.5*cdfchi("X", 2*(n+1), P, Q)
>
> Which the gives you the same result
n = 1:5
P = (1 - 0.5*0.05)*ones(n)
Q = 1 - P
Upper95=0.5*cdfchi("X", 2*(n+1), P, Q)'
5.5716434
7.2246877
8.7672731
10.241589
11.668332
Perfect agreement! I should have thought of it myself..............
But: why does it have to be so difficult for an experimental physicist when
trying to assess the uncertainties of low numbers?
Heinz
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