Browsing Acta Universitatis Lodziensis. Folia Oeconomica nr 225/2009 by Title
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A Proposal of New Classification Algorithm
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)In the paper a new method of classifying points to a predetermined number of classes is presented. The method is based on the use of the sample/window mean shift technique to obtain a synthetic insight into the data set ... 
About Robust Estimators of Average Shape and Variance of Shape
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)In this paper we investigate whether in the statistical inference for shapes of economic systems it is useful to modify least squares methods (commonly used Procrustes approach) by applying data depth concept. In the paper ... 
An Influence of Distance Measure Among Sample Units on Efficiency of the Modified Synthetic Estimator : Monte Carlo Analysis
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)The problem of insufficient number of sample observations representing a given population domain of interest (small area) can be solved by applying estimators, which will be able to combine sample information from the given ... 
Application of Discriminant Analysis and Neural Networks to Forecasting the Financial Standing of Farms
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)The aim of the research was to determinate a linear discriminant function and neural network that could be applied for financial situation forecasting in polish farms sector. The construction of discriminant models was ... 
Attempt to Assess Multivariate Normality Tests
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)The assumption of multivariate normality is a basis of the classical multivariate statistical methodology. Consequences of departures from these assumptions have not been investigated well so far. There are many methods ... 
Clustering Methods Applied to Reduce the Training Sample Size in Support Vector Machines
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)Support vector machines belong to the group of methods of supervised learning. They generate nonlinear models with good generalization abilities. The core of SVMs algorithm is the quadratic program which is solved for ... 
Comparing Income Distributions  Methods and their Application to Wage Distributions in Poland
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)Rankings of income distributions are usually based on comparisons of social welfare. Assuming more or less general form of a social welfare function we can compare income distributions in time and in space. Income inequality ... 
Duration of Unemployment in the Area of the District Job Centre of Pabianice in the Year 2005 : Empirical Analysis of Changes in Time by DemoSocial Features
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)Duration is one of the most serious drawbacks of the national unemployment. Some data on the unemployment structure including duration of remaining unemployed and selected demosocial features are available on the government ... 
Economic and Sociological Community of Łódź until the Year 1945
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)At the turn of the 19th and the 20th century the process popularization of economy and sociology in Łódź was mainly carried out by the public Universities. The local press which published papers of eminent scientists aided ... 
Estimation of Variance of Logistic Regression Predictors for Small Areas
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)Logistic regression models can be applied for analysis of Bernoulli variables in studies of small areas. In the paper the logistic regression predictors for parameter of the Bernoulli distribution and an estimation of ... 
Evaluation of Investing Efficiency of Open Pension Funds by Means of the Method of Cluster Analysis
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)The following study aims at analyzing the activity of open pension funds so far. To evaluate their efficiency, the author uses profitability indicators of investment portfolio such as Sharpe, Treynor and Jensen Ratio as ... 
First Statisticians of Łódź
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)In the years 19121914, the Łódź Exchange Committee made first attempts to establish Łódź municipal statistics. On September 19th 1917 the City Council decided to bring into being the Department of Statistics next to the ... 
Forecasting Income Distributions of Households in Poland on the Basis of Markov Chains
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)In order to forecast income distributions of population, we can make use of, among others, stochastic processes. These processes can be used to determine probabilities of transition of households from one income class to ... 
Internal Cluster Quality Indexes for Classification of Symbolic Data
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)This paper describes main classification methods used for symbolic data (e.g. data in form of: single quantitative value, categorical value, interval, multivalued variable, multivaliued variable with weights) presents ... 
Introduction
(Wydawnictwo Uniwersytetu Łódzkiego, 2009) 
Knowledge Indicators for Polish Provinces
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)Knowledgebased economy (KBE) has been recently the subject of many analyses and academic research. Methods of its assessment have been worked out by a few international institutions such as the World Bank. Their experts ... 
KruskalWallis Test in Multiple Comparisons
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)In this paper we show that the KruskalWallis test can be transform to quadratic form among the MannWhitney or Kendal τ au concordance measures between pairs of treatments. A multiple comparisons procedure based on patterns ... 
Limit Property of a Compound of the Generalized Negative Binomial and Beta Distributions
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)In Central European Journal of Mathematics (CEJM) 2(4) 2004, 527537 T. Gerstenkorn published a probability distribution as a result of compounding of the generalized negative binominal distribution with the generalized ... 
Macroeconomic Risk of Investment Portfolios at the Warsaw Stock Exchange
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)The essay presents the attempt to examine selected macroeconomic risk factors of portfolio Investments in Polish capital market as well as to build investment portfolios sensitive to particular risk profiles. With this ... 
Measures of Diversity and the Classification Error in the Multiplemodel Approach
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)Multiplemodel approach (model aggregation, model fusion) is most commonly used in classification and regression. In this approach K component (single) models C1(x), C1(x), … , CK(x) are combined into one global model ...