Jul 16th, 2008| 01:00 pm | Posted by vlk
The Χ2 distribution plays an incredibly important role in astronomical data analysis, but it is pretty much a black box to most astronomers. How many people know, for instance, that its form is exactly the same as the γ distribution? A Χ2 distribution with ν degrees of freedom is
p(z|ν) = (1/Γ(ν/2)) (1/2)ν/2 zν/2-1 e-z/2 ≡ γ(z;ν/2,1/2) , where z=Χ2.
Continue reading ‘chi-square distribution [Eqn]’ »
Mar 21st, 2008| 06:20 pm | Posted by hlee
Markov chain Monte Carlo (MCMC) never misses a week from recently astro-ph. A book titled MCMC in astronomy will be a best seller. There are, in addition, very interesting non MCMC preprints. Continue reading ‘[ArXiv] 3rd week, Mar. 2007’ »
Tags:
chi-sq,
Fourier Analysis,
GREAT08,
lensing,
likelihood,
misnomer,
Poisson noisy image,
sparse Category:
Cross-Cultural,
Jargon,
MCMC,
arXiv |
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