Today, we will go further on the inference of copula functions. Some codes (and references) can be found on a previous post, on nonparametric estimators of copula densities (among other related things). Consider (as before) the loss-ALAE data...

(This article was first published on Freakonometrics - Tag - R-english, and kindly contributed to R-bloggers) Last week, we've introduced the concept of exchangeable variables, i.e. satisfying for any matrix , i.e. is a permutation matrix: belongs to the orthogonal group, , and with elements in . It is possible to extend that family, considering all matrices in the...

I recently discovered a fascinating series of technical reports from the 1970s in the Purdue University e-Pubs archive that shine a surprising light on what are now known as the Halstead metrics. The first surprises came from Halstead’s A Software Physics Analysis of Akiyama’s Debugging Data; surprising in the size of the data set used