Browsing Acta Universitatis Lodziensis. Folia Oeconomica nr 225/2009 by Issue Date
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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 ... -
Measures of Diversity and the Classification Error in the Multiple-model Approach
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)Multiple-model 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 ... -
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 ... -
Optimum Chemical Balance Weighing Design with Correlated Errors Based on Bipartite and Ternary Designs
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)The paper is studying the estimation problem of individual weights of objects using the chemical balance weighing design under the restriction on the number times in which each object is weighed. It is assumed that the ... -
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 ... -
Sequential Probability Ratio Test for Mean Based on Pseudo-Likelihood Function
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)Hypotheses about expected value of random variable can be verified by means of the parametric sequential probability ratio test in case of the known class of this variable's distribution. The problem with verification of ... -
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 ... -
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 ... -
On the Multivariate Test for Stability of the Population Proportions
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)The paper investigates the problem of testing the hypothesis of the stability proportion for multiple attributes. It is assumed that two random samples of size n0 and n1, respectively an selected from the population. In ... -
On Testing Linearity of Trend Function
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)Testing the goodness of fit between a hypothetical trend function and its non-parametric variant will be considered. This problem was analysed e.g. by Domanski (1979, 1990), Wywiał (1990, 1995). Our result can be treated ... -
Knowledge Indicators for Polish Provinces
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)Knowledge-based 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 ... -
Ordering the Spatial Units by the Non-standard Method at Various Standarization Transformations
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)Applying various standardization transformations for the set of characteristics we receive various ordering of spatial units. In the paper for the purpose of ordering we used the nonstandard method in two variants: of the ... -
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 ... -
The Wavelet Transform in Regression
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)The wavelet transform was introduced in the 19S0's and it was developed as an alternative in tin short time Fourier transform. The wavelets theory is very popular in signal processing and pattern recognition and its ... -
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 non-linear models with good generalization abilities. The core of SVMs algorithm is the quadratic program which is solved for ... -
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 ... -
Remarks on Classical Means for One and Many Samples
(Wydawnictwo Uniwersytetu Łódzkiego, 2009)In the paper there were given basic designations for one and many samples in reference to classical means. In the next there were introduced the optimization criteria defining classical means for one sample, also for 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 ... -
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 ... -
Duration of Unemployment in the Area of the District Job Centre of Pabianice in the Year 2005 : Empirical Analysis of Changes in Time by Demo-Social 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 demo-social features are available on the government ...