Document Detail

Development of a statistical model for estimating spatial and temporal ambient ozone patterns in the Sierra Nevada, California.
MedLine Citation:
PMID:  12806049     Owner:  NLM     Status:  MEDLINE    
Statistical approaches for modeling spatially and temporally explicit data are discussed for 79 passive sampler sites and 9 active monitors distributed across the Sierra Nevada, California. A generalized additive regression model was used to estimate spatial patterns and relationships between predicted ozone exposure and explanatory variables, and to predict exposure at nonmonitored sites. The fitted model was also used to estimate probability maps for season average ozone levels exceeding critical (or subcritical) levels in the Sierra Nevada region. The explanatory variables--elevation, maximum daily temperature, and precipitation and ozone level at closest active monitor--were significant in the model. There was also a significant mostly east-west spatial trend. The between-site variability had the same magnitude as the error variability. This seems to indicate that there still exist important site features not captured by the variables used in the analysis and that may improve the accuracy of the predictive model in future studies. The fitted model using robust techniques had an overall R2 value of 0.58. The mean standard deviation for a predicted value was 6.68 ppb.
Haiganoush K Preisler; Michael J Arbaugh; Andrzej Bytnerowicz; Susan L Schilling
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Publication Detail:
Type:  Journal Article     Date:  2002-01-17
Journal Detail:
Title:  TheScientificWorldJournal     Volume:  2     ISSN:  1537-744X     ISO Abbreviation:  ScientificWorldJournal     Publication Date:  2002 Jan 
Date Detail:
Created Date:  2003-06-13     Completed Date:  2004-08-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101131163     Medline TA:  ScientificWorldJournal     Country:  United States    
Other Details:
Languages:  eng     Pagination:  141-54     Citation Subset:  IM    
Pacific Southwest Research Station, 800 Buchanan St., West Annex, Albany, CA 94710, USA.
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MeSH Terms
Atmosphere / chemistry*
Models, Statistical*
Nitrates / chemistry
Ozone / analysis*,  chemistry
Reproducibility of Results
Research Design
Time Factors
Reg. No./Substance:
0/Nitrates; 10028-15-6/Ozone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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