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Instrumental Variable Methods for the Estimation of Test Score Reliability

Inner London Education Authority

Harvey Goldstein

University of London Institute of Education

The method of Instrumental Variables is suggested as an alternative to traditional methods for estimating the reliability of mental test scores which avoids certain drawbacks of these methods. The consistency and efficiency of the instrumental variable method are examined empirically using data from the British National Child Development Study in an analysis of 16 year, 11 year and 7 year old scores on tests of mathematics and reading.

Key Words: Instrumental Variables • Errors in Variables • Reliability • Longitudinal • Educational Attainment

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