Psychoacoustic tes t s can give valuable information for pedagogical and technical rehabilitation of hearing-impaired subjects. The two tes t s described he re give a contribution to the development of such tests . 1) The intensity-discrimination t e s t showed la rge variations of DI between the subjects and no correlation between DI and hearing los s (more than 85 dB ). m 2) The F1 discrimina...

The nonparametric Wilcoxon Rank Sum (also known as the Mann-Whitney U) and the permutation t-tests are robust with respect to Type I error for departures from population normality, and both are powerful alternatives to the independent samples Student's t-test for detecting shift in location. The question remains regarding their comparative statistical power for small samples, particularly for n...

In this study, we compared the Student's t-test, Welch's and Mann-Whitney U test, in terms of their type I error rate statistical power when assumptions parametric tests are violated different situations. Materials used consisted random numbers generated using Numpy library Python programming language. All were from a normal distribution with N (0, 1) parameters. Balanced unbalanced experimenta...

A series of transport, biostimulation, and activity push-pull tests were performed under induced and natural gradient conditions in a trichloroethene (TCE) and cis-dichloroethene (c-DCE) contaminated aquifer. Transport tests demonstrated the feasibility of injecting and recovering complex solute mixtures from the aquifer. During the biostimulation tests, decreases in toluene concentration and t...

BACKGROUND Microvolt T-wave alternans (MTWA) is a promising method for noninvasive assessment of arrhythmic risk. Recent studies have shown good immediate reproducibility of T-wave alternans. Little is known about it during the long term. The aim of the study was to prospectively evaluate the long-term reproducibility of MTWA in a group of patients after ICD implantation. METHODS The study gr...