00000nam 2200000zi 4500 9.882693 CaOODSP 20241203113653 m o d f cr ||||||||||| 191206e199301##bccd ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn-bc En57-45/93-11E-PDF McCollor, Doug, author. An investigation of daily maximum ground-level ozone concentration forecasting using CART statistical techniques / Doug McCollor. [Vancouver] : Atmospheric Environment Service, Pacific Region, Atmospheric Issues & Services Branch, January, 1993. 1 online resource (31 pages) : graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier Report PAES ; 93-11 Title from cover. Some copies of PAES 93-11 labelled as PAES 93-2. At head of title: Atmospheric Issues & Services Branch report. Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (page 11). "CART (Classification and Regression Trees), a relatively new statistical analysis and prediction technique in the field of meteorology, was used to study ground-level ozone concentration data obtained during a forecasting experiment in the summer of 1992. Data from six ozone monitoring sites throughout Vancouver and the Lower Mainland were used in the study. It was found that the CART techniques were comparable, but not more favorable, with standard meteorological statistical techniques employed during the original experiment. This study also used time-series representation of the CART results and data. The analysis shows that the CART technique as used in this case relies strongly on the previous day's maximum ozone concentration level as a predictor, resulting at times in a one-day time lag response. The forecast ozone concentration values are also a result of smoothing by the CART statistical technique, diminishing extreme-valued events in the observed data set. As a result, two "poor" air quality events which occurred in the experiment were not predicted by any of the statistical methods studied to date"--Abstract, page [1]. Ozone Environmental aspects British Columbia Lower Mainland Forecasting Statistical methods. Air quality British Columbia Lower Mainland Forecasting. Ozone Aspect de l'environnement Colombie-Britannique Lower Mainland Prévision Méthodes statistiques. Air Qualité Colombie-Britannique Lower Mainland Prévision. Canada. Environment Canada. Canada. Atmospheric Environment Service. Pacific Region. Atmospheric Issues and Services Branch. Report PAES ; 93-11. (CaOODSP)9.879827 PDF 1.01 MB https://publications.gc.ca/collections/collection_2019/eccc/En57-45-93-11-eng.pdf