Регрессия с категориальными предикторами: критика применения фиктивных переменных и логлинейный анализ как альтернативный подход
The focus of this article is the methodological aspect of protest behavior determinants identifying; specifically variants of handling with categorical (nominal and ordinal) predictors which hypothetically explain this or that protest potency level. Thus, when using regression for explaining the protest potency levels one may transform categorical predictors into dummy variables. Such a solution makes the model bulky and generates troubles with assessing this model. The authors suggested loglinear analysis as the alternative to the mentioned solution. There search’s aim was parallel implementing the two mentioned methods and comparing them on the base of i) the suggested a priori criteria and ii) gained empirical results. The raw data were extracted from Elektoral'naya Panel 2011–2012of WCIOM. The dependent variable was Protest Potential; the hypothetical predictors belonged to the socio-economic bloc of the Panel. The results show that there are serious statistical reasons to reconsider methods of determinants identifying when working with categorical variables, and loglinear analysis worked better comparing the quality and the set of determinants.
In this study a CHAID-based approach to detecting classification accuracy heterogeneity across segments of observations is proposed. This helps to solve some important problems, facing a model-builder: (1) How to automatically detect segments in which the model significantly underperforms? and (2) How to incorporate the knowledge about classification accuracy heterogeneity across segments to partition observations in order to achieve better predictive accuracy? The approach was applied to churn data from the UCI Repository of Machine Learning Databases. By splitting the data set into four parts, which are based on the decision tree, and building a separate logistic regression scoring model for each segment we increased the accuracy by more than 7 percentage points on the test sample. Significant increase in recall and precision was also observed. It was shown that different segments may have absolutely different churn predictors. Therefore such a partitioning gives a better insight into factors influencing customer behavior.
This article revisits the evolution of intergenerational social mobility in Soviet and post-Soviet Russia. In particular, it looks at historical changes in the residential, educational and occupational mobility of Russians. The study contributes to the literature by extending the spectrum of institutional and historical contexts, in which the (in)equality of opportunity has been considered so far, re-examining existing evidence by using alternative datasets and a different methodology.
For an empirical investigation I utilize data from four representative cross-national surveys conducted in Russia in 1994, 2002, 2006 and 2013. Following the theoretical arguments developed in the comparative social mobility research and being informed by their empirical findings, I anticipated (1) a trend towards lesser openness in the late years of the Soviet era; (2) a temporary discontinuity of mobility patterns during the turbulent 1990s; and (3) the stagnation of social mobility in the more stable years of Russia’s post-Soviet history. However, my findings reveal no unambiguous trends suggested by previous research, moreover they contradict some of the earlier evidence. In particular, I found (1) steadily decreasing residential mobility both in absolute and relative terms (implying increasing closure of residential communities); (2) a weakening link between parental and child educational attainment in the post-Soviet era; and (3) the invariance of social fluidity in terms of occupational attainment both in the Soviet and post-Soviet periods. The paper concludes by highlighting some of the remaining questions and possible directions for future research.
Published here is the second part of the article. It begins with discussion of loglinear modeling, a technique which is used to analyze mobility tables and to explore the patterns of relative social mobility. In the rest of the article I discuss the empirical findings with regard to the three dimensions of social mobility outlined above. Finally I draw the conclusions, which generalize findings from both parts of the article.
Procedure for the simulation of the advances in EGE from mathematics is considered. For some tasks the important predictors are obtained. The models of binary logistics regression and ordinal regression for the prediction of probabilities of solution of task are built.
The article studies educational trajectories of schoolchildren in Yaroslavl Oblast. Conclusions point out that schoolchild’s educational achievements, educational plans of his/her friends and the level of education of his/her father are key predictors of a decision about continuing education. Thanks to this information it is possible to know which schoolchildren are at risk of not continuing their studies. In the course of the research comparative advantages of the logistic regression and the discriminant analysis in the case of binary dependent variables were examined. With the necessary prerequisites for the use of methods fulfilled, both strategies work well classifying schoolchildren.
In 2006, Russia amended its competition law and added the concepts of ‘collective dominance’ and its abuse. This was seen as an attempt to address the common problem of ‘conscious parallelism’ among firms in concentrated industries. Critics feared that the enforcement of this provision would become tantamount to government regulation of prices. In this paper we examine the enforcement experience to date, looking especially closely at sanctions imposed on firms in the oil industry. Some difficulties and complications experienced in enforcement are analysed, and some alternative strategies for addressing anticompetitive behaviour in concentrated industries discussed.
This article is talking about state management and cultural policy, their nature and content in term of the new tendency - development of postindustrial society. It mentioned here, that at the moment cultural policy is the base of regional political activity and that regions can get strong competitive advantage if they are able to implement cultural policy successfully. All these trends can produce elements of new economic development.