Monthly Archives: October 2013

Recursive marginal likelihood estimators …

Just a quick note to advertise the once-revised draft of my recursive marginal likelihood estimators paper, now on astro/stat-ph: http://arxiv.org/pdf/1301.6450.pdf . The new version includes a greater emphasis on the applicability of these ideas (characterised by biased sampling) to the problem … Continue reading

Posted in Dirichlet Processes, Marginal Likelihood Estimation, Measure Theory, Statistics | Leave a comment

Silliness with p-values at big n

There’s another of the crazy papers on astro ph today about the handedness of spiral galaxies; this one by serial offender, Lior Shamir ( http://arxiv.org/pdf/1310.7485.pdf ).  The author claims to show that there is a significant difference between the colours of … Continue reading

Posted in Astronomy, Astrostatistics, Bad Science, Rants | 5 Comments

Importance sampling reweighting from an infinite mixture model to a finite mixture model …

I finally derived an expression for the Radon-Nikodym derivative of a k component finite Normal mixture model with respect to an equivalent infinite dimensional (Dirichlet process prior) mixture model; this was required for the revisions to my recursive marginal likelihood … Continue reading

Posted in Dirichlet Processes, Infinite-Dimensional Inference, Marginal Likelihood Estimation, Measure Theory, Statistics | 1 Comment

How not to write a pedagogical paper …

Bit disappointed after reading the Lombardi et al. paper (link) on spatial Poisson processes today for two reasons: 1) the discussion is limited to a very simplistic (not really as a stochastic process) description of the SPP, along with a … Continue reading

Posted in Astrostatistics, Bad Science, Rants | Leave a comment

General probabilistic theories …

During my regular* sit down with Nature magazine today I stumbled upon an intriguing quote with regards to attempts to reformulate quantum mechanics as a theory of observation under uncertainty: “A lot of features we think of as uniquely quantum … Continue reading

Posted in Uncategorized | 1 Comment

Pure stochastic star formation is ruled out. Or is it?

A bold proclamation by Pflamm-Altenburg et al. today (link) that the theory of pure stochastic star formation for the initial cluster (stellar) mass function (ICMF) is ruled out by the Sharma et al. (2011) mass – radius dataset. The ICMF … Continue reading

Posted in Astronomy, Astrostatistics, Bad Science, Order Statistics, Quantile Regression | 5 Comments

Another kind of tempering …

Another paper on astro ph today about parallel tempering for exploring the gravitational wave signal posterior, this one by Farr et al. But, I’m going to overlook their missed trick on the possible use of RLR/biased sampling for evidence estimation … Continue reading

Posted in Astrostatistics, Marginal Likelihood Estimation, Statistics | 2 Comments