Many English adjectives form the comparative in two ways, so that, for instance, prouder occurs alongside more proud. The availability of several forms raises the general questions of when and why speakers choose one variant over the other. The aim of this article is to identify factors of language structure and language use that underlie the comparative alternation and to determine their relat...

Cluster structure in (multicollinear) data can be utilized by pattern recognition methods in order to find adequate subspaces for nonlinear regression. When regressing a particular severely nonlinear function, it is demonstrated that this approach is superior to polynomial PLS. It is also demonstrated that for nonlinear functions, the choice of regressing explained variables onto the explaining...

This course is an introduction to the mainstay of quantitative empirical work in political science, the linear regression model. We begin by putting the regression model in context by discussing causation, generalization, and quasi-experimentation. We then introduce the basic two-variable regression model, discuss its assumptions, and learn how to test hypotheses with it. This is followed by th...

Finite mixture models have come to play a very prominent role in modelling data. The finite mixture model is predicated on the assumption that distinct latent groups exist in the population. The finite mixture model therefore is based on a categorical latent variable that distinguishes the different groups. Often in practice distinct sub-populations do not actually exist. For example, disease s...

This chapter describes a tree-structured extension and generalization of the logistic regression method for fitting models to a binary-valued response variable. The technique overcomes a significant disadvantage of logistic regression, which is interpretability of the model in the face of multicollinearity and Simpson’s paradox. Section 1 summarizes the statistical theory underlying the logisti...

common bacterial blight (cbb) caused by xanthomonas axonopodis pv. phaseoli is a serious disease of bean fields in iran and the world. chemical control of cbb is inefficient, therefore the use of resistant genotypes with stability production is the most suitable alternative. stability and adaptability of 26 bean genotypes yield in the presence and absence of cbb were evaluated in agricultural r...