http://hdl.handle.net/11089/1363 Statystyka w praktyce społeczno-gospodarczej 2026-04-05T15:10:37Z http://hdl.handle.net/11089/1950 Wstęp Baszczyńska, Aleksandra; Domański, Czesław Wstęp do numeru 272/2012 Acta Universitatis Lodziensis, Folia Oeconomica 2012-01-01T00:00:00Z http://hdl.handle.net/11089/1932 Metody klasyfikacyjne danych w analizach wirtualnych łańcuchów dostaw Trzpiot, Grażyna; Ganczarek, Alicja In this paper the classification of data obtained in the survey of Silesian businesses is presented. The survey was aimed at production, commerce and service enterprises, The main objective was to classify the factors determining the virtual supply chain consisting of IT and communication systems logistic competences and the transport-spedition-logistic branch. Due to the qualitative and quantitative character of variables, methods based on varying similarity measures were used. 2012-01-01T00:00:00Z http://hdl.handle.net/11089/1931 Test symetryczności Li Baszczyńska, Aleksandra Symmetry test proposed by Li in 1997, is a test that uses kernel method. In the statistical inference using kernel methods, we need to determine the kernel function and the smoothing parameter. The author analyzes the influence of choice of the kernel function and smoothing parameter for a procedure of verification the hypothesis of random variable distribution symmetry. Li symmetry test is also used in the analysis of Human Development Index. 2012-01-01T00:00:00Z http://hdl.handle.net/11089/1930 Zastosowanie modeli ARIMA w badaniach nad stresem ekonomicznym wpływającym na kondycję biologiczną populacji ludzkich Żądzińska, Elżbieta; Domański, Czesław; Rosset, Iwona; Mikulec, Artur The research on the relations between economic stress and the value of secondary sex ratio (SSR) was initiated by Trivers and Willard (1973). The seminal study in this field speculated that smaller (than needed) consumption of goods and services might sufficiently stress human populations and make the secondary sex ratio lower. In order to verify the hypothesis that the observed time-series of secondary sex ratio (SSR) in Poland is declining with the deterioration in „economic conditions”, the ARIMA mathematic model of both analysed phenomena (according to the statistical procedure proposed by Catalano and Bruckner (2005)) was constructed. The analysis is an attempt to answer the question: if the statistically important decline of SSR in Poland after the Second World War was an effect of deterioration of economic condition. 2012-01-01T00:00:00Z