In the present research article, we applied Wilks Lambda on two different pharmacokinetic studies. In the first study we check the bioavailability of the three different formulations (Dynapar QPS). We check the effectiveness of these formulations using Wilks Lambda. We found no significant difference in the effectiveness as measured by pharmacokinetic parameters. For the second study, we test t...

The Wilks’ Lambda Statistic (likelihood ratio test, LRT) is a commonly used tool for inference about the mean vectors of several multivariate normal populations. However, it is well known that the Wilks’ Lambda statistic which is based on the classical normal theory estimates of generalized dispersions, is extremely sensitive to the influence of outliers. A robust multivariate statistic for the...

Ontogenetic changes in body shape and its associated allometry were studied in the Blacktail Shiner, Cyprinella venusta, using geometric morphometric methods. We used a single, large sample (n 5 397; 182 males, 215 females), collected in Catahoula Creek, Jourdan River drainage, Hancock County, Mississippi. Ten body landmarks were digitized from each specimen, which yielded partial warp scores t...

When the covariance matrix formulation is used for multilook polarimetric synthetic aperture radar (SAR) data, Wilks' Lambda can be change detection between acquisitions at two time points. We briefly describe theory dual polarization, diagonal only data. A case study illustrates technique on Sentinel-1 C-band data covering international Frankfurt Airport. successfully detect including directio...

Correspondence to: Marco Orsini – Programa de Pós-Graduação em Ciências da Reabilitação – Praça das Nações, 34, Bonsucesso – CEP: 21041-021 – Rio de Janeiro (RJ), Brazil – E-mail: [email protected] Presentation: Jul. 2013 – Accepted for publication: Feb. 2014 – Financing source: none – Conflict of interests: nothing to declare – Approval at the Ethics Committee n. 119.818 (UNISUAM). ABSTR...

A commonly used procedure for reduction of the number of variables in the linear discriminant analysis is the stepwise method for variable selection. Although often criticized, when used carefully, this method can be a useful prelude to a further analysis. The contribution of a variable to the discriminatory power of the model is usually measured by the maximum likelihood ratio criterion, reffe...

We develop an asymptotic likelihood ratio test for multivariate lognormal data with a point mass at zero in each dimension. The test generalizes Wilks' lambda and Hotelling T-test to the case of semicontinuous data. Simulations show that the resulting test statistic attains the nominal Type I error rate and has good power for reasonable alternatives. We conclude with an application to explorati...