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National Center for Statistics and Analysis, National Highway Traffic Safety Administration.  Revised Catalog of Types of Applications Implemented Using Linked State Data.  DOT HS 808 793.  Washington, DC:  Department of Transportation, October, 1998.

(245K) The updated compendium of analyses and reports by CODES states and NCSA, using the linked data. It is arranged by type of analysis, and provides contacts for obtaining the reports.

National Center for Statistics and Analysis, National Highway Traffic Safety Administration.  Catalog of Types of Applications Implemented Using Linked State Data.  DOT HS 808 581.  Washington, DC:  Department of Transportation, April, 1997.

(260k) A compendium of analyses and reports by CODES states and NCSA, using the linked data. It is arranged by type of analysis, and provides contacts for obtaining the reports.

National Highway Traffic Safety Administration.  Report to Congress on Benefits of Safety Belts and Motorcycle Helmets, Based on Data from the Crash Outcome Data Evaluation System (CODES).  DOT HS 808 347.  Washington, DC:  Department of Transportation, February, 1996.

(153k) Provides person-specific, population-based outcome information used to evaluate the effectiveness of safety belts and motorcycle helmets in terms of mortality, morbidity, severity, and cost.  

National Highway Traffic Safety Administration.  Why Data Linkage?  DOT HS 808 461.  Washington, DC:  Department of Transportation, October, 1996.

(274k)  "Why Data Linkage" provides a complete but brief summary of what data linkage is, the various types of applications for linked data that have been identified and successfully implemented by the CODES states, and how interested states can obtain information about implementing CODES.

Johnson, Sandra W. and Walker, Jonathan.  NHTSA Technical Report: The Crash Outcome Evaluation System (CODES).  DOT HS 808 338.  Washington, DC:  Department of Transportation, National Highway Traffic Safety Administration, January, 1996.

(813k)  Includes technical information about the probabilistic linkage and state specific results to serve as a background reference for the Report to Congress on Benefits of Safety Belts and Motorcycle Helmets.

Johnson, Sandra W., Walker, Jonathan, Utter, Dennis.  Research Note:  Crash Outcome Data Evaluation System (CODES) Project Safety Belts and Helmet Analysis.  Washington, DC:  Department of Transportation, National Highway Traffic Safety Administration, February, 1996.

(25k)  Summarizes technical information about the data collection methodology, outcome measures, contributing factors considered ,and how the state specific results were combined statistically to determine the benefits of safety belts and motorcycle helmets for the Report to Congress.  

Johnson, Sandra W.  So You Want To Link Your Data.  DOT HS 808 426. Washington, DC:  Department of Transportation, National Highway Traffic Safety Administration, July, 1996.

(813k)  Provides step by step instructions on how to identify the data resources, edit the state data, locate the cases related to motor vehicle crashes, perform the linkage, and validate the results.  

Walker, Jonathan, Ph.D.  Methodology Application document:  Logistic Regression Using the CODES Data.  DOT HS 808 460.  Washington, DC:  Department of Transportation, National Highway Traffic Safety Administration, September, 1996.

(794k)  Provides background in Chi-Square Analysis and simple linear regression, introduces odds, odds ratios, logits, probabilities, relative risk, and effectiveness and gives examples of logistic regression. CODES data are used for the examples.  Also available in WordPerfect 6.1 format, with hyperlinks (1.1 MB) .

National Highway Traffic Safety Administration. Catalog of Types of Applications Implemented Using Linked State Data (CODES). DOT HS 808 581. Washington, DC: Department of Transportation, April, 1997.

(266k) Presents types applications for linked state data that will be used to support state-specific efforts in the original seven CODES states (Hawaii, Maine, Missouri, New York, Pennsylvania, Wisconsin, Utah) and three additional states (Alaska, Connecticut, New Mexico). The types of applications are listed under one of six subject areas: Injury Prevention, Traffic Safety, Highway Safety, EMS, Data Quality, and Validating Linked Data. The scope, data used, format, description and contact person are listed for each application.

To obtain more information about CODES, contact Dennis Utter at:

NHTSA
400 7th Street SW
NRD-31, Room 6125
Washington, DC 20590

FAX (202) 366-7078

Please send any comments to: ncsaweb@nhtsa.dot.gov

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