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1

On portfolio analysis using oriented fuzzy numbers for the trade-related sector of the Warsaw Stock Exchange

Łyczkowska-Hanćkowiak Anna, Wójcicka-Wójtowicz Aleksandra

Operations Research and Decisions

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2023

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Vol. 33, No. 4

155--170

EN

Oriented fuzzy numbers are useful in portfolio management since they convey information regarding uncertainty and imprecision when considering financial markets. One may apply a fuzzy discount factor and an imprecise present value in the form of a trapezoidal oriented fuzzy number. An investor can obtain recommendations on individual stocks (buy, sell, accumulate, reduce). Analogous recommendations are also issued by experts. In such cases, recommendations are mostly based on available data and expert’s knowledge and experience. The purpose of the paper is to present a procedure for comparing the accuracy of both types of recommendations. Also, the real impact the recommendations have on potential changes in portfolio composition in trading-related industries is considered. The research uses quotations from companies from the trading sector of the Warsaw Stock Exchange (WSE). Theoretical considerations are presented in the form of an empirical case study.

2

Wewnątrzlaboratoryjna kontrola badań

Lato-Karjakin E.

Laboratorium - Przegląd Ogólnopolski

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2017

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nr 9-10

74--78

PL

Zrozumienie teorii dotyczącej kontroli wewnątrzlaboratoryjnej pozwala na podejmowanie właściwych działań, w tym działań korygujących lub zapobiegawczych, które zapewnią wiarygodne wyniki badań. W artykule przedstawiono kolejne etapy codziennej, wewnętrznej kontroli w medycznym laboratorium diagnostycznym. Każdy z nich, począwszy od ustalenia dopuszczalnych wartości błędów całkowitych, akceptowalnej nieprecyzyjności i obciążenia, poprzez przeprowadzenie okresu wstępnego, sporządzenie kart kontrolnych Levey-Jenningsa, wybranie reguły interpretacyjnej oraz prowadzenie bieżącej kontroli z zastosowaniem elementów Sigma-metrii, jest jednakowo ważny dla efektu końcowego. Rezultatem świadomego prowadzenia procesu kontrolnego w laboratorium jest wydanie wiarygodnego wyniku, który staje się podstawą skutecznej diagnozy i leczenia pacjentów.

EN

Understanding the theory concerning interlaboratory quality control allows to take right measures, including corrective or preventive actions, that will ensure reliable test results. The article presents subsequent stages of daily internal control in a medical diagnostic laboratory. Each of them, from establishing admissible values of total errors, allowable imprecision and bias, to carrying out an initial period, preparing Levey-Jennings control charts, selecting an interpretation rule and maintaining current control with use of the elements of Sigmametrics, is equally important for the final effect. The outcome of carrying out conscious control process in a laboratory is delivering credible test result, that become the basis for an effective diagnosis and patient treatment.

3

Uncertainty and imprecision in medical diagnosis support

Straszecka E.

Journal of Medical Informatics & Technologies

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2012

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Vol. 19

11--22

EN

The paper concerns methods of representation of uncertainty and imprecision in successful medical support applications. Advantages of the methods are pointed out and some of their drawbacks are explained. A method of simultaneous representation of imprecision of symptoms and uncertainty of diagnostic rules is proposed. The method suggests an extension of the Dempster-Sahfer theory for fuzzy focal elements. An example of the method is given and their links as well differences from previous approaches are discussed. Conclusions about uncertainty and imprecision representation in medical diagnosis support are provided.