Gaussian graphical lasso is a tool for estimating sparse graphs using a Gaussian log-likelihood with an 1 penalty on the inverse covariance matrix. This paper proposes a generalization to meta-elliptical distributions. Conditional uncorrelatedness is characterized in meta-elliptical families. The proposed metaelliptical and re-weighted Kendall graphical lassos are computed from pseudo-observati...

It is well established that hepatic abnormalities may occur in patients with rheumatoid arthritis (RA) and other connective tissue disorders and these changes have usually been attributed to the systemic nature of the underlying disease process. Abnormalities reported include minor derangements of liver function (Movitt and Davis, 1953) and other abnormalities which have been related to the sev...

The search for species associations is one of the classical problems of community ecology. This article proposes to use Kendall’s coefficient of concordance (W ) to identify groups of significantly associated species in field survey data. An overall test of independence of all species is first carried out. If the null hypothesis is rejected, one looks for groups of correlated species and, withi...

While in an earlier commentary (Honing & Ladinig, 2008) we stressed the potential of Web-delivered experiments for music perception research, the ongoing discussion on Web-based versus lab-based studies seems to circle around issues of method and control (Mehler, 1999; Kendall, 2008). We agree with the importance of these issues from a methodological point of view. However, we continue to stres...