You are here:
PRECISION OF VARIABLE PROBABILITY SAMPLING WHEN THE RESPONSE VARIABLE AND INCLUSION PROBABILITIES ARE NOT HIGHLY CORRELATED
Citation:
Stehman, S. PRECISION OF VARIABLE PROBABILITY SAMPLING WHEN THE RESPONSE VARIABLE AND INCLUSION PROBABILITIES ARE NOT HIGHLY CORRELATED. U.S. Environmental Protection Agency, Washington, D.C., EPA/620/R-94/013.
Description:
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. imulation results using binary and continuous response variables demonstrate quantitatively how uch precision may be lost in this situation. ariable 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.