Temat: trends analysis - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Zbiory przybliżone w badaniach koniunktury gospodarczej
Rough Sets in !nvestigation$ of Economic Conditions in Construction Industry
Autorzy:: Perkowska, Eleonora
Wachecka-Skowron, Anna
Powiązania:: https://bibliotekanauki.pl/articles/500340.pdf
Data publikacji:: 1998
Wydawca:: Szkoła Główna Handlowa w Warszawie
Tematy:: Badania statystyczne, Analiza danych statystycznych, Koniunktura gospodarcza, Budownictwo, Teoria zbiorów przybliżonych
Statistical surveys, Statistical data analysis, Business trends, Construction sector, Rough set theory
Opis:: The problem of imperfect knowledge became crucial issue for many applications including economic applications. Rough set theory, proposed by Z. Pawlak (1982) is one of the existing approaches to understanding and manipulation of imperfect knowledge. This theory has attracted many researchers and practitioners all over the world, who contributed essentially to its numerous developments and applications. The aim of this chapter is to present preliminaries of rough set theory (including information systems and decision tables, indiscernibility, lower and upper approximations of sets, reducts, patterns) and application of rough set methods to the construction industry data analysis with respect to the economic conditions. We present some methods based on rough set approach for solution of the following problems related to the analysis of such data: - Extracting dependencies between queries in questionnaires. - Searching for relationships between respondent answers and classification. - Extraction of (minimal) relevant subsets of queries predicting with high quality answers for other questions. Characterization of respondent situation changes in the consecutive year quarters. We discuss the results of Computer experiments including also visual representation of the received results.
Źródło:: Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 1998, 60; 151-178
0866-9503
Pojawia się w:: Prace i Materiały Instytutu Rozwoju Gospodarczego SGH
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Statystyczna analiza wyników testu koniunktury
Statistical Analysis of Results of Business Activity Tests
Autorzy:: Podgorska, Maria
Powiązania:: https://bibliotekanauki.pl/articles/500506.pdf
Data publikacji:: 1998
Wydawca:: Szkoła Główna Handlowa w Warszawie
Tematy:: Koniunktura gospodarcza, Metoda testu koniunkturalnego, Wnioskowanie statystyczne, Analiza statystyczna
Business trends, Business condition test method, Inferential statistics, Statistical analysis
Opis:: Results of business activity tests are characterized by very strong structural variation. Complex, multidimensional structure of population of enterprises being considered is the main source of diversity. Dynamic approach introduces periodical variation in values of certain variables, intensity of observed processes, and quality of ex post predictions. For instance, in construction industry, one factor which introduces the largest variation is the criterion of ownership. Also for industrial enterprises and trading companies, the largest differences are observed between groups of public sector and private sector enterprises. For the purpose of analysis of business activity tests results, traditional statistical methods may be used. In this chapter we introduce point estimators and interwal estimators of balances and business activity indicators. We consider the problem of aggregation of balances and define distribution of aggregated balances and its main moments. We present a construction of a significance test with test statistics A which has asymptotically normal distribution. The test measures significance of differences of business activity indicators between selected structural groups. We list assumptions necessary to obtain probability distributions of appropriate variables and show the most important properties of these distributions. Applications of proposed statistical analysis methods are described using construction industry activity data for Poland and Italy. As an example of conclusions drawn for Poland, we found strong correlation between assessments of business activity and sociopolitical conditions, as well as unfair treatment of different groups of business enterprises by central administration. Analysis of seasonal variation of construction industry activity confirmed legitimacy of assumed business activity indicator. It is a leading indicator which precedes changes in economic situation by about 3 months. Results of business activity tests for Italian industry do not confirm existence of significant seasonal variation of business activity. Results aggregated over 30 years of conducting tests in Italy clearly indicate that in construction industry, unfavorable periods outnumber favorable ones.
Źródło:: Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 1998, 60; 65-88
0866-9503
Pojawia się w:: Prace i Materiały Instytutu Rozwoju Gospodarczego SGH
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Analiza taksonomiczna w zastosowaniu do badań koniunktury budownictwa
Taxonomic Analysis of Economic Situation in Construction Industry
Autorzy:: Marcinkowska-Lewandowska, Wanda
Powiązania:: https://bibliotekanauki.pl/articles/500640.pdf
Data publikacji:: 1998
Wydawca:: Szkoła Główna Handlowa w Warszawie
Tematy:: Koniunktura gospodarcza, Budownictwo, Metody statystyczne, Metody ekonometryczne, Analiza taksonomiczna
Business trends, Construction sector, Statistical methods, Econometric methodology, Taxonomic analysis
Opis:: This chapter contains analysis of questionnaires data base which was built by selecting one of several qualitative characteristics formulated with relation to each of the issues included in the questionnaire. The subject of examination is a set of multi- profile elements. In the initial part of the chapter, a method of division of such a set of objects into subsets including similar objects has been presented. Similarity of the objects is the basis for describing a function of distance between them. Then, by analyzing values of distance function, the entire set is divided into clusters. Research premise is executed in two sections. By calculating the distance between characteristics of analyzed phenomenon, which are represented by items in the questionnaire, a group of similar features - or lack of relationship between features - are determined. Second facet of the analysis consists in determining the distances of multi-profile objects from fixed standards, and division of the set of objects into homogenous layers. In paragraphs that follow, results of research conducted using the above method, and concerning changes in economic situation of Polish construction industry in 1993 - 1997 are shown. On the basis of the questionnaire data from the Institute of Economic Development and obtained from construction enterprises, mutual relationships between measures of economic situation have been examined. Moreover, changes in economic situation of construction enterprises in comparison to their distance from standards of economic situation have been analyzed, both in the entire population of enterprises and in two sectors of construction industry: private and public.
Źródło:: Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 1998, 60; 129-150
0866-9503
Pojawia się w:: Prace i Materiały Instytutu Rozwoju Gospodarczego SGH
Dostawca treści:: Biblioteka Nauki

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