Record Display for the EPA National Library Catalog


Main Title Comparison of R- and Q-Modes in Target Transformation Factor Analysis for Resolving Environmental Data.
Author Hwang, C. S. ; Severin, K. G. ; Hopke, P. K. ;
CORP Author Illinois Univ. at Urbana-Champaign. Inst. for Environmental Studies.;Environmental Sciences Research Lab., Research Triangle Park, NC.
Year Published 1984
Report Number EPA/600/J-84/240;
Stock Number PB85-170124
Additional Subjects Environmental surveys ; Air pollution ; Mathematical models ; Comparison ; Sources ; Reprints ; R mode analysis ; Q mode analysis
Library Call Number Additional Info Location Last
NTIS  PB85-170124 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 10p
A target transformation factor analysis has been used for the quantitative resolution of environmental data. The initial studies have utilized the correlation between samples as the matrix defining the relationships within the data. The analysis of this matrix is a Q-mode analysis. For large data sets, this technique requires the diagonilization of a large matrix. An alternative approach is to examine the matrix of correlations between the measured parameters. The analysis of this matrix is called an R-mode analysis. It is found that for several typical data sets, equivalent results are obtained for the two modes and, in some cases, R-mode may yield better results. The faster diagonalization and smaller memory requirements of R-mode would seem to make it preferable.