skip to main content skip to footer

Correcting for Implicit Selection on a Variable Which Has Not Been Observed

Boldt, Robert F.
Publication Year:
Report Number:
ETS Research Memorandum
Document Type:
Page Count:
Subject/Key Words:
Data Analysis, Statistical Analysis


It is hoped that readers who might know of data to which the present method applies could alert the author as to its existence. The type of situation of interest is where there is a population for which one wants to estimate the mean and standard deviation, but where data are available on a subset of that population, and where the subset is a known fraction of the population of interest. The data needed on the subset are the mean, variance, and third moment—or the observations themselves for which to calculate these statistics.

Read More