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NCJ Number: 63808 Add to Shopping cart Find in a Library
Title: AGGREGATION BIAS - AN EMPIRICAL DEMONSTRATION
Journal: SOCIOLOGICAL METHODS AND RESEARCH  Volume:8  Issue:1  Dated:(AUGUST 1979)  Pages:69-94
Author(s): J E MOORMAN
Corporate Author: Sage Publications, Inc
United States of America
Date Published: 1979
Page Count: 26
Sponsoring Agency: Sage Publications, Inc
Thousand Oaks, CA 91320
US Dept of Health, Education, and Welfare
Rockville, MD 20852
US Dept of Health,Education, and Welfare
Bethesda, MD 20014
Grant Number: NIGMS-GM01190; 1P01 HD05876
Type: Report (Study/Research)
Format: Article
Language: English
Country: United States of America
Annotation: THIS RESEARCH PAPER EXAMINES WHETHER AGGREGATION AT THE CENSUS TRACT LEVEL RESULTS IN SIGNIFICANT INFLATION OF THE CORRELATION BETWEEN FERTILITY VARIABLES AND WHETHER THE INFLATION OCCURS IN A SYSTEMATIC WAY.
Abstract: IN ORDER TO ASSES THE EXTENT OF THE BIAS THAT EXISTS IN ECOLOGICAL CORRELATIONS CENSUS DATA FROM THE PUBLIC USE SAMPLE AND CENSUS SUMMARY, TAPES FOR THE EAST CHICAGO STANDARD CONSOLIDATED AREA WERE USED AND A COMPARISON MADE OF CORRELATION AND REGRESSION COEFFICIENTS OF THE INDIVIDUAL VERSUS TRACT LEVEL. THE ASSUMPTION OF LARGER AGGREGATE LEVEL COEFFICIENTS WAS NOT CONSISTENTLY UPHELD. ALTHOUGH FREQUENTLY AGGREGATE COEFFICIENTS WERE LARGER THAN INDIVIDUAL LEVEL COEFFICIENTS, AT BOTH TRACT AND COUNTY LEVELS, AGGREGATE COEFFICIENTS WERE OBSERVED THAT WERE SMALLER OR IDENTICAL TO INDIVIDUAL LEVEL COEFFICIENTS. A TWO-VARIABLE AGGREGATE REGRESSION EQUATION WAS ESTIMATED FOR THE PREDICTION OF CURRENT FERTILITY AT THE TRACT LEVEL. THE EQUATION WAS ACCEPTABLE SINCE THE AGGREGATE REGRESSION COEFFICIENTS WERE RELATIVELY CLOSE TO THE INDIVIDUAL LEVEL COEFFICIENTS. TABULAR DATA, NOTES, AND REFERENCES ARE INCLUDED. (AUTHOR ABSTRACT MODIFIED--MJW)
Index Term(s): Behavioral and Social Sciences; Evaluation; Evaluation techniques; Research; Research methods; Sociology
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http://www.ncjrs.gov/App/publications/abstract.aspx?ID=63808

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