Now showing items 1-20 of 30

    • Comparing Income Distributions - Methods and their Application to Wage Distributions in Poland 

      Jędrzejczak, Alina (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 

      Gatnar, Eugeniusz (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 ...
    • The Method of Risk Measurement in Case of Stochastic Definition of Net Present Value 

      Białek, Jacek (Wydawnictwo Uniwersytetu Łódzkiego, 2009)
      The Net Present Value (NPV) rule is a base of modern finance theory. The classical definition of NPV is based on unrealistic assumptions: it treats the discount rate as a deterministic and constant function. The above fact ...
    • Economic and Sociological Community of Łódź until the Year 1945 

      Kuciński, Julian (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 

      Ceranka, Bronisław; Graczyk, Małgorzata (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 

      Dudek, Andrzej (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 

      Pekasiewicz, Dorota (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 ...
    • A Proposal of New Classification Algorithm 

      Korzeniewski, Jerzy (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 ...
    • An Influence of Distance Measure Among Sample Units on Efficiency of the Modified Synthetic Estimator : Monte Carlo Analysis 

      Jurkiewicz, Tomasz (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 

      Domański, Czesław (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 

      Kończak, Grzegorz; Czogała, Maria (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 

      Kończak, Grzegorz; Wywiał, Janusz (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 

      Pawluczuk, Andrzej (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 

      Mantaj, Andrzej; Wagner, Wiesław (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 

      Pruska, Krystyna (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 

      Trzęsiok, Joanna (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 

      Trzęsiok, Michał (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 

      Mikulec, Artur (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 ...
    • Selected Premium Estimation Methods in Automobile Liability Insurance 

      Szymańska, Anna (Wydawnictwo Uniwersytetu Łódzkiego, 2009)
      Correct insurance premiums estimation constitutes the basis for the insurance activity. Premiums should be estimated in a way that does not let the insurance company incur financial losses and prevents the insured from ...
    • Remarks on Classical Means for One and Many Samples 

      Wagner, Wiesław (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 ...