i*****r
发帖数: 24 | 1 看到个问题，已知degree of freedom N-1,
和 （kai) x^2,查表得，x^2 falls between 0.9 and 0.5,
conclusion data set is Poisson distribution.
不是统计专业的，不懂为什么，请给点建议。谢谢。 | m****r
发帖数: 237 | 2 这个问题不是很明确。。不过看你的意思应该是在test if the data follows a poiss
on distribution or not.
Chisq-test can be used to test whether a random variable is from some specif
ied distribution, for instance, poisson in your case.
Your p-value here is between 0.5 and 0.9, you can't reject your null hypothe
sis, which is the data follows poisson distribution. That's how you get your
result.
There is a theorem behind this. You can google for chi-square test for it. O
ne of the application of Chi-square test
【在 i*****r 的大作中提到】
: 看到个问题，已知degree of freedom N-1,
: 和 （kai) x^2,查表得，x^2 falls between 0.9 and 0.5,
: conclusion data set is Poisson distribution.
: 不是统计专业的，不懂为什么，请给点建议。谢谢。
| P****D
发帖数: 11146 | | i*****r
发帖数: 24 | 4 thanks for replying. the question is this, i explained it wrongly, yesterda
y.
" A series of 25 measurements on a radioactive sample provides a mean of 950
and value of 17,526 for sum(xi-r)^2(for i=1 to N), Do the data follow norma
l distribution?"
Ans: use formula, chi^2=18.5. look at table p between 0.9 to
0.5. so is Poisson Distribution. |
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