Browsing by Subject "regression model"

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Access status: Open Access ,
Ecological rating of mercury ions in water bodies
(2008) Neverova-Dziopak, Elena
Heavy metal compounds are toxic for human health and water biota. Furthermore the metal salts can inhibit the process of photosynthesis and biochemical oxidation of organic substances in water that brings to the violation of ecological equilibrium and degradation of water ecosystem. All European countries established the permissible concentrations of mercury in water for different types of water usage (water supply, fishery, recreation). The established water quality standards not always take into account the interest of water ecosystems and provide ecological security for surface water. Hence, in order to provide the ecological equilibrium of surface waters it is necessary to elaborate the ecological standards of water quality. Methodology of ecological standards’ elaboration is presented in the paper. On the base of elaborated ecological standards the permissible loads of pollution can be estimated that do not exceed the ecological capacity of water ecosystem. Such approach enables the elaboration of ecologically and economically proved technical and organization measures aimed to the preservation of surface water good ecological state.
Access status: Open Access ,
Przykłady zależności pomiędzy dochodem a wydatkami na konsumpcję w przypadku losowości zmiennej niezależnej
(2007) Czapkiewicz, Anna
In this paper we consider two methods for estimating parameters in the linear model. First approach is the classical regression model where it is assumed that independent variable is deterministic. In the second one we assume that both independent as well as dependent variables are randomly distributed values related with each other by linear relationship and we build the model used for parameters' estimation. For model evaluation we made a comparison of two approaches using data from GUS.