In this note we discuss in general how to test the implementation code of statistical tests, and then we treat in detail the case of the Kolmogorov-Smirnov test. It will be shown that some “obvious” expected properties, like the flatness distributions of p-values from repeating drawings from the same parent distribution, are not indeed reproduced even in absence of bugs in the code, due to eith...

The existence of machine readable text makes possible the development of new techniques that assist the literary scholar in locating interesting passages of text. In this paper we explore in a preliminary manner the possibility of adapting techniques developed in the field of document retrieval to the full text context. As an alternative to the conventional Boolean logic based approaches, we co...

The major purposes of statistics are to help us understand and describe phenomena in our world and to help us draw reliable conclusions about those phenomena. Yet, for want of exposure to statistical theory and practice, it continues to be regarded as the Achilles heel by all concerned in the loop of research and publication. There are many different types of statistical analysis. Choosing the ...

The usual statistical tests of trend are inappropriate for demonstrating the absence of trend. This is because failure to reject the null hypothesis of no trend does not prove that null hypothesis. The appropriate statistical method is based on an equivalence test. The null hypothesis is that the trend is not zero, i.e., outside an a priori specified equivalence region defining trends that are ...

The massive construction in poor lands has encouraged engineers to use deep foundations in order to transfer superstructure loads to the subsoil. Since soil excavation, sampling, and laboratory testing as a part of site investigation are relatively difficult, in-situ tests such as cone penetration test (CPT) as a very informative test may be recommended. The CPT has been widely used in engineer...

A statistical test for detecting genetic differentiation of subpopulations is described that uses molecular variation in samples of DNA sequences from two or more localities. The statistical significance of the test is determined with Monte Carlo simulations. The power of the test to detect genetic differentiation in a selectively neutral Wright-Fisher island model depends on both sample size a...

2 Abstract. We investigated testing the likelihood of a phylogenetic tree by comparison to its subtree pruning and regrafting (SPR) neighbors, with or without re-optimizing branch lengths. This is inspired by aspects of Bayesian significance tests, and the use of SPRs for heuristically finding maximum likelihood trees. Through a number of simulations with the Jukes-Cantor model on various topol...

A new method, ParaFit, has been developed to test the significance of a global hypothesis of coevolution between parasites and their hosts. Individual host-parasite association links can also be tested. The test statistics are functions of the host and parasite phylogenetic trees and of the set of host-parasite association links. Numerical simulations are used to show that the method has correc...

For incremental iterative software development processes, automated testing is necessary to enable evolution not only in terms of functionality, but in terms of software quality as well. Automation requires models to provide the necessary information. Scenarios and use cases do not only feed requirements engineering, they may also be the basis for testing. They have to be enriched by detailed b...

The u~u~l statistical tests of trend are inappropriate for demonstrating the absence of trend. ThIS IS because failure to reject the null hypothesis of no trend does not prove that null hypothe~is: The appropriate statistical method is based on an equivalence test: The null ~ypothesI~ IS that the trend is not zero, i.e., outside an a priori specified eqUIvalence reg~on definmg t~ends that are c...