Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Precision of Variable Sampling When the Response Variable and Inclusion Probabilities Are Not Highly Correlated.
Author Stehman., S. V. ;
CORP Author Oregon State Univ., Corvallis. Dept. of Statistics.;Corvallis Environmental Research Lab., OR.
Publisher Apr 94
Year Published 1994
Report Number EPA-R-816721; EPA/620/R-94/013;
Stock Number PB94-160546
Additional Subjects Sampling ; Environmental monitoring ; Probability theory ; Population(Statistics) ; Mathematical models ; Statistical samples ; Variance(Statistics) ; Correlations ; Variable probability ; EMAP(Environmental Monitoring and Assessment Program) ; Environmental Protection Agency
Library Call Number Additional Info Location Last
NTIS  PB94-160546 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/01/1994
Collation 14p
Variable probability sampling may be less efficient than simple random sampling if the response variable, y, is not highly positively correlated with the auxiliary variable, x, used to select the sample. Simulation results using binary and continuous response variables demonstrate quantitatively how much precision may be lost in this situation. Variable probability sampling may be less efficient for populations with correlations as high as .50, and efficiency relative to simple random sampling may be as low as 25-50% for low correlation populations.