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

Author(s):

Boldt, Robert F.

Publication Year:

1974

Report Number:

RM-74-20

Source:

ETS Research Memorandum

Document Type:

Report

Page Count:

6

Subject/Key Words:

Data Analysis, Statistical Analysis

Abstract

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.

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