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Comparison of Several Linear Ordering Methods for Selection of Locations in Order‑picking by Means of the Simulation Methods
(Wydawnictwo Uniwersytetu Łódzkiego, 2018)When a company uses a shared storage system, selection of locations during the order‑picking process is not an obvious task. Every location where the picked product is placed, can be described by means of several variables, ... -
Comparison of Several Linear Ordering Methods for Selection of Locations in Order‑picking by Means of the Simulation Methods
(Wydawnictwo Uniwersytetu Łódzkiego, 2018)When a company uses a shared storage system, selection of locations during the order‑picking process is not an obvious task. Every location where the picked product is placed, can be described by means of several variables, ... -
The Differentiation of Firm Survival Models in the Poviats of the Zachodniopomorskie Voivodeship
(Wydawnictwo Uniwersytetu Łódzkiego, 2017)The aim of the study was to construct models of firms’ survival duration for individual poviats in the Zachodniopomorskie Voivodeship. The first stage was the calculation of the Kaplan‑Meier estimator and the use of a test ... -
Efektywność procesu kształcenia w wyższych szkołach zawodowych w 2012 roku
(Wydawnictwo Uniwersytetu Łódzkiego, 2016)The aim of this article is to evaluate the efficiency of teaching activities and qualification of ranking of efficiency of higher vocational education schools in the year 2012. The analysis comprises 25 higher vocational ... -
Efficiency frontier on Japanese banking system
(University of Lodz, 2015-12)Since the emergence of the efficiency frontier techniques, a series of comparisons between the methods that led to the resultant efficiency has been presented. In this paper, data from 99 Japanese banks are used in order ... -
Investment Risk Measurement Based on Quantiles and Expectiles
(Wydawnictwo Uniwersytetu Łódzkiego, 2018)In the presented research, we attempt to examine special investment risk measurement. We use quantile regression as a model by describing more general properties of the response distribution. In quantile regression, we ... -
Investment Risk Measurement Based on Quantiles and Expectiles
(Wydawnictwo Uniwersytetu Łódzkiego, 2018)In the presented research, we attempt to examine special investment risk measurement. We use quantile regression as a model by describing more general properties of the response distribution. In quantile regression, we ... -
Modeling the Survival Time of Trading Companies in the Zachodniopomorskie Voivodship
(Wydawnictwo Uniwersytetu Łódzkiego, 2018)The aim of this study was to construct models of trading companies’ lifespan, in individual districts of Zachodniopomorskie Voivodship. The author verified whether the impact of the survival time of trading companies on ... -
A New Test for Independence in 2×2 Contingency Tables
(Wydawnictwo Uniwersytetu Łódzkiego, 2017)In statistical literature there exist many tests to reveal the independence of two qualitative variables in two‑way contingency tables (CTs), in particular in 2×2 CTs. In this paper four independence tests were compared. ... -
On Testing Significance of the Multivariate Rank Correlation Coefficient
(Wydawnictwo Uniwersytetu Łódzkiego, 2018)The Spearman’s rho is a measure of the strength of the association between two variables. There are some extensions of this coefficient for the multivariate case. Measures of the multivariate association which are the ... -
On the Monitoring Complex Multivariate Processes
(Wydawnictwo Uniwersytetu Łódzkiego, 2016)This article presents a proposal of the method of monitoring complex multidimensional processes. The problem relates to monitoring the quality of production with some attribute variables when the production is performed ... -
One Value of Smoothing Parameter vs Interval of Smoothing Parameter Values in Kernel Density Estimation
(Wydawnictwo Uniwersytetu Łódzkiego, 2017)Ad hoc methods in the choice of smoothing parameter in kernel density estimation, although often used in practice due to their simplicity and hence the calculated efficiency, are characterized by quite big error. The ... -
Outliers vs Robustness in Nonparametric Methods of Regression
(Wydawnictwo Uniwersytetu Łódzkiego, 2018)The article addresses the question of how robust methods of regression are against outliers in a given data set. In the first part, we presented the selected methods used to detect outliers. Then, we tested the robustness ... -
Selected Statistical Tests for Median and Their Properties
(Wydawnictwo Uniwersytetu Łódzkiego, 2017)In the paper, a selection of statistical tests for median are presented. In particular, parametric and nonparametric significance tests are considered. In the case of parametric tests the critical regions are constructed ...