The final library file of formatted data contains nearly 250 individual NCLAN data sets comprised from 43 studies from four continental regions collected over 7 years (1980-1986). Data was collected to study response of various cultivars to ozone. Data were formatted into three categories: descriptive information, air quality data, and plant-response data. Coordinated analysis of the data included developing dose-response functions for the economic assessment incorporating experiment to experiment variation into measures of precision of estimated relative yield losses and investigating alternative methods of analyses. Dose-response models were developed for economic assessment by combining all data for each crop species to model assumptions and homogeneity of response to ozone over cultivars, sites and years. Methods used in these combined analysis included analyses of variance, polynomial and nonlinear regression analyses. Transformations of the data and of models were used when necessary based on development of residual and normal plots, Box-Cox analyses and Barlett's Chi-square Test for homogeneity of variance. An 'average' response was computed from models for each species, even though the response was known to be heterogeneous in most cases.

"Contract no. IAG DW12931347." "Journal article." "EPA/600/J-88/274." "Published in Environmental Pollution, 53:462-465. 1988." Microfiche.