In _ Zytkow and Zembowicz (1993), a system for cluster analysis, based on two-way contingency tables, has been proposed. In its original form, the system is con ned to categorical and discrete multivariate data. The aim is to build a classi cation tree when, at each level of the tree, only binary splits are allowed. Within a one-level taxonomy formation, a systematic search is performed for pai...

Many stability measures, such as Normalized Mutual Information (NMI), have been proposed to validate a set of partitionings. It is highly possible that a set of partitionings may contain one (or more) high quality cluster(s) but is still adjudged a bad cluster by a stability measure, and as a result, is completely neglected. Inspired by evaluation approaches measuring the efficacy of a set of p...

grape vine is one of the important horticultural crops with unique standing as regards use and consumption. the fruit is utilized from immature to ripened state and as raisins. its leaves can be used when they are soft and fresh. therefore it is necessary to improve iranian grapevine quality as well as quantity. the main purpose of this study was the use of phenyl phetalamic acid (ppa) to incre...