Now showing items 2-21 of 37

    • Causality Analysis of Survey Nonresponse – A Counterfactual Perspective 

      Bednarski, Tadeusz (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      Declining participation rates in social surveys stimulate research to better understand nonresponse mechanisms and their impact on related statistical inference. In this paper we focus on potential causal relationship ...
    • Cluster Analysis – Symbolic vs. Classical Data 

      Wilk, Justyna; Pełka, Marcin (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      Clustering problem is addressed in many contexts and disciplines. Although there are numerous studies on cluster analysis, there is a lack of a review to complete and systematize knowledge of research approach depending ...
    • Comparison of Accuracy of Affinity Propagation Method and Cluster Ensembles Based on Co-Occurrence Matrix 

      Rozmus, Dorota (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      High accuracy of results is a very important task in any grouping problem (clustering). It determines effectiveness of the decisions based on them. Therefore in the literature there are proposed methods and solutions ...
    • Comparison of Estimators of a Probability of Success in Two Models 

      Zieliński, Wojciech (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      In modeling two valued phenomena a binomial or negative binomial model is applied. In the paper minimum variance unbiased estimators of a probability of success obtained in two models are compared.
    • Conjoint Analysis as a Method of Analysing Consumer Preferences on Example of Municipal Transport Market 

      Cheba, Katarzyna; Kiba-Janiak, Maja (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      Satisfying customers' needs, is a challenge for many companies in today’s rapidly changing environment. To study customer needs and preferences conjoint analysis can be used. Conjoint analysis is a multidimensional method ...
    • Construction of the Measurement Scale for Consumer’s Attitudes in the Frame of One-Parametric Rasch Model 

      Tarka, Piotr (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      The article discusses issues concerning the scale design based on one-parametric Rasch model in the context of consumers’ attitudes. The first part describes the specificity of the measurement in the light of Item Response ...
    • {Depthproc} Package in Multivariate Time Series Mining 

      Kosiorowski, Daniel; Bocian, Mateusz; Węgrzynkiewicz, Anna; Zawadzki, Zygmunt (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      In this paper we present our novel R package {depthproc} which implements several multivariate statistical procedures induced by statistical depth functions and we discuss some examples and applications of the package ...
    • Experimental Design in Evaluating VaR Forecasts 

      Małecka, Marta (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      Following a dynamic development of VaR estimation methods from 90s, in recent literature much attention has been paid to testing procedures designed to evaluate quality of VaR models. There has been a wide-ranging ...
    • Extracting Class Description from Support Vector Machines 

      Trzęsiok, Michał (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      Support Vector Machines (SVMs) belong to the group of Data Mining and Machine Learning methods. SVMs are considered to be one of the best classification methods in terms of performance measure. The biggest disadvantage ...
    • Feature Selection in High Dimensional Regression Problem 

      Kubus, Mariusz (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      There are three main approaches to feature selection problem considered in statistical and machine learning literature: filters, wrappers and embedded methods. Filters evaluate and exclude some variables before learning ...
    • Financial Inclusion Indicators in Poland 

      Gatnar, Eugeniusz (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      Financial inclusion refers to a state in which all working age adults have effective access to credit, savings, payments, and insurance from formal service providers. The aim of this paper is to introduce several indicators ...
    • Generalizations of Tukey-Lambda Distributions 

      Domański, Czesław; Bolonek-Lasoń, Katarzyna (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      The Generalized Lambda Distribution (GλD) is a four-parameter generalization of Tukey’s Lambda family. Several methods for estimating the parameters of the GλD have been reported in the literature, but the most popular ...
    • Gravity Unfolding Analysis for Asymmetric Similarities Matrix 

      Zaborski, Artur (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      The multidimensional unfolding analysis which uses in the structure the gravity function allows consideration and analysis of additional factors (such as market share or brand loyalty), which affect the assessments of ...
    • Indirect Estimation Accounting for Spatial Autocorrelation in Economic Statistics 

      Dehnel, Grażyna; Klimanek, Tomasz; Kowalewski, Jacek (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      The authors present results of a study which attempted to use indirect estimation methods (including a method accounting for spatial correlation) to estimate certain characteristics enterprises. The study relied on data ...
    • Influence of Inaccuracy Measurement On Middle- Operating Control Costs 

      Chmielińska, Magdalena (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      Control charts are commonly used in plants to monitor the correctness of manufacturing process, due to their simplicity and explicitness of diagnosis. Qualification mistakes make that the signals, appear either with lag, ...
    • Influence of Unemployed Person Age on the Hazard and its Changes in Time 

      Bieszk-Stolorz, Beata; Markowicz, Iwona (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      The aim of the article is to analyse the influence of unemployed person’s age on job seeking time. This influence can changes in time. That analysis is possible by using Cox nonproportional hazard model. We get the marks ...
    • Insurance in Polish Small and Medium-Sized Enterprises – Survey Results for the Period of 2010-2012 

      Gajda, Damian; Jurkiewicz, Tomasz (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      The sector of small and medium-sized enterprises (SME) is an important part of the insurance market. The growth of the economy and the changes occurring in Poland are the reasons for some changes in the behavior of ...
    • Introduction 

      Domański, Czesław; Mikulec, Artur (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
    • Jan Piekalkiewicz – A Statistician of the Second Polish Republic 

      Domański, Czesław (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
    • Karolina Iwaszkiewicz-Gintowt (1902–1999) 

      Krzyśko, Mirosław (Wydawnictwo Uniwersytetu Łódzkiego, 2013)
      This paper describes the life and scientific achievements of Karolina Iwaszkiewicz- Gintowt, who before World War II worked with Jerzy Spława-Neyman.