To evaluate compound-related effects on the growth of rodents, body weight and food consumption data are commonly collected either weekly or biweekly in toxicology studies. Body weight gain, food consumption relative to body weight, and efficiency of food utilization can be derived from body weight and food consumption for each animal in an attempt to better understand the compound-related effe...

This article introduces (and hopes to encourage thereby) the econometrics practitioner to (use) a homoscedasticity test referred to in the field of statistics as the modified Levene test. Econometrics orthodoxy (from University to practice level) has focused mainly on three heteroscedasticity tests, namely the Goldfeld-Quandt (GQ), Breusch-Pagan-Godfrey (BPG), and the White (W) test. The differ...

Sediment grain size is measured using a variety of methods, but comparisons of measurement methods on environmental samples are limited. Three instruments (Coulter LS230, Horiba LA900, and SediGraph 5100) utilizing two fundamentally different operating principles were employed to measure a single set of 20 different sediment samples collected at shelf depths from the Southern California Bight. ...

MOTIVATION Cross-platform microarray analysis is an increasingly important research tool, but researchers still lack open source tools for storing, integrating and analyzing large amounts of microarray data obtained from different array platforms. RESULTS An open source integrated microarray database and analysis suite, WebArrayDB (http://www.webarraydb.org), has been developed that features ...

There has been debate regarding which method to use to analyze repeated measures continuous data when the design includes only two measurement times. Five different techniques can be applied and give similar results when there is little to no correlation between preand post-test measurements and when data at each time point are complete: 1) analysis of variance on the difference between preand ...

Locating pairwise differences among treatment groups is a common practice of applied researchers. Articles published in this journal have addressed the issue of statistical inference within the context of an analysis of variance (ANOVA) framework, describing procedures for comparing means, among other issues. In particular, 1 article (Jaccard & Guilamo-Ramos, 2002b) presented some new methods o...