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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
The use of cluster analysis to evaluation half-year measurement campaign of gaseous elemental mercury from atmospheric station Křešín u Pacova
 Veselik, P. ; Dvorská, Alice
This paper deals with evaluation of gaseous elemental mercury in the air from Atmospheric Station Křešín u Pacova. The measurements were conducted with two identical instruments positioned right next to each other in one ground-based container in a 10 min time step, between December 2012 and June 2013. This measurement campaign was aggregated into approximately weekly intervals. The aim of this paper is to show the use of cluster analysis for finding those time periods which correspond the most according to appropriately selected criteria. Classification was performed by using cluster analysis of regression coefficients obtained by modelling weekly measurements by the second device on the measurements from the first device. Results of this analysis indicate the existence of five periods in which the regression lines show certain similarities. Further attention is paid to their analysis.
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Statistical Evaluation of Atmospheric Mercury Measurements Conducted in Parallel with Two Identical Instruments
 Veselík, P. ; Dvorská, Alice ; Michálek, J.
At the Atmospheric Station Křešín u Pacova, central Czech Republic, total gaseous mercury was measured in background ambient air with two automatic mercury TEKRAN 2537B analyzers positioned right next to each other in one container. The measurements were conducted with a 10 min time step, between December 2012 and August 2013. The aim of the study was to confirm or exclude the hypothesis of same measurement results provided by the instruments. Measured data were aggregated into 1 week subsets and statistically analysed. The data was graphically visualised and evaluated by using exploratory data analysis. For comparing the performance of both instruments nonparametric statistical analysis (Wilcoxon matched pairs test) was used. The performed analysis shows statistically significant differences between measurements from the two instruments.
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2 Veselík, P.
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