A6_Mercado2004FactorAnalysis

A6_Mercado2004FactorAnalysis - Application of Factor...

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Source: TCEQ / TAD / FIM. Created on 2/26/04 4:09 PM. Revised on 3/23/04 Application of Factor Analysis to the BRAVO Dataset Prepared by Texas Commission on Environmental Quality Data Analysis Section Fernando Mercado Stuart Dattner Bethany Georgoulias
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Application of Factor Analysis to the BRAVO Dataset Source: TCEQ / TAD / FIM. Created on 2/26/04 4:09 PM. Revised on 3/23/04 2 Contents I. Introduction. ………………………………………………………………… 3 II. Data Limitations………………………………………………………….…. 3 III. Data Preparation…………………………………………………………. .. 3 a. All Texas Site…. .………………………………………………………… 3 b. Big Bend Only…………………………………………………………… 4 IV. Factor Analysis Procedure ………………………………………………. . 6 V. Rotated Factor Pattern Results …………………………………………. ... 8 VI. Interpretation of Factors……………………………………………. .…. ... 10 VII. Maximum Daily Concentrations……………………………………. .…. . 10 VIII. Spatial Average Concentrations……………………………………. ..… 11 IV. Conclusion ……………. .…………………………………………. .………. 12 - 29 X. Figures ……………………………………………………………. ...……… 30 XI. References. .…………………………………………………. ..……………. 31
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Application of Factor Analysis to the BRAVO Dataset Source: TCEQ / TAD / FIM. Created on 2/26/04 4:09 PM. Revised on 3/23/04 3 I. Introduction The potential decline of visibility at Big Bend National Park (BBNP) is an important problem the Big Bend Aerosol and Visibility Observational study (BRAVO) was designed to address. This paper focuses on the application of factor analysis to the BRAVO aerosol (PM2.5) dataset. Through factor analysis, it is possible to investigate the factor structure underlying the set of observed variables. This paper will also investigate seasonal, extreme and mean values, with respect to species related to factors identified through the factor analysis. II. Data Limitations During the BRAVO study, Caney Creek, AR and Wichita Mountains, OK (see figure 20) were the only sampling sites outside of Texas. Due to data filtering, these two sampling sites were not used (see II.a. - Data Preparation) in the analysis. Having no sampling sites outside of Texas, this data set cannot sufficiently address the issue of particulate matter being transported into Texas by winds. This is especially relevant because an analysis of maximum daily concentrations suggests that there were significant sources to the east and northeast of Texas that might have been missed by the monitoring network used in the BRAVO Study. Therefore the analysis must rely on other methods to estimate PM such as, back trajectories and modeling. III.a.
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This note was uploaded on 07/14/2011 for the course STA 4702 taught by Professor Staff during the Spring '08 term at University of Florida.

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A6_Mercado2004FactorAnalysis - Application of Factor...

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