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Hamel Letter

Challenge Issues Challenge Cases


Actual Earnings Use
Average Statistics
Basic Analysis Methodology
Broad Support
Census Bureau Caveat
Chronic Disability
Corcione Article
CPS Data Validity
CPS Definition of Work Disability
CPS Self-reported Disability
CPS Use by Other Researchers
Daubert/Kumho Standards - WLE
Employment, Earnings, & Disability
Expert Qualifications
First Work Disability Question
Hale Article
Hamel Letter
Heterogeneity
Medical Impairment Ratings
Multi-year Data Averaging
Offset Use
Possibility of Future Disability
Residual Capacity
Sample Selection Bias
Skoog & Toppino Article
Temporary Disability
VALE Software
Veteran's Disability

 

Usual Opposition Position
Some feel that a letter written in 1994 by Harvey Hamel, a senior supervisory economist at the Bureau of Labor Statistics, offers evidence that the CPS is invalid for the purposes of worklife expectancy computation.
 
VEI Position
Much of Hamel’s criticism centers on the monthly survey, though The New Worklife Expectancy Tables use the March supplement to the CPS, not the standard monthly survey.  This Supplement is the source of the data published by the Census Bureau in its 1983 and 1989 publications, Labor Force Status and Other Characteristics of Persons With a Work Disability.  Therefore, by virtue of these publications and the fact that the Census Bureau continues to calculate and disseminate work disability data, the government has acknowledged the validity of CPS data for measuring the earnings and employment experiences of persons with a work disability.  These data are also validated by virtue of their repeated use by other nonforensic researchers

When discussing the March supplement, Hamel notes that the data “. . . would not provide overall estimates of the disabled population or workforce.”  Note that this caveat for use of the data is that the CPS should not be used to measure the size (prevalence) of the disabled population.   Hamel notes that this arises from the fact that the CPS does not attempt to measure persons with a non-work disability.  The criticism is not relevant to The Tables, since Hamel’s preferred definition includes people with a disability who are not limited in the amount or kind of work they can perform.  This definition is much broader than the work disability definition relevant to forensic cases, the definition used by the CPS and in The Tables.

There is no official government position against use of the CPS to define Work Disability. In fact the Census Bureau regularly generates cross-tabulations of this data and publishes it on its web site.  In fact, two noted former Census officials (McNeil and Miller) have authored affidavits to the validity of CPS for measuring Work Disability.

 
Related Challenges
Anglin v. Reed McGonigal v. Lucas Petridge v. Hewlett-Packard
 
Related Articles
Gibson (2001) Gibson & Tierney (2000) Skoog & Toppino (1999)

Last modified: Tuesday April 03, 2007 02:57 PM


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