NIOSH Industry and Occupation Computerized Coding System (NIOCCS)

Performance Rates

Baseline performance measures for NIOCCS autocoding are based on accuracy rates of the data that is autocoded by the system.  The accuracy threshold for NIOCCS is 10% or less error rate found in autocoded records.  NIOCCS accuracy rates are continually monitored for all files submitted by NIOSH to ensure the accuracy threshold is met.  For NIOSH V3.0, accuracy was tested using large sets of records that were coded and verified by NIOSH trained industry and occupation coders.

Production rates are determined by calculating the percent of records coded automatically by NIOCCS. It is important to note that the quality of data input for coding can result in very different autocoding production rates. Using the benchmarks set for coding accuracy, the average NIOCCS production rates for autocoding over time are shown below.  These percentages are based on internal NIOSH data submissions to NIOCCS using the High Confidence Level option in Versions 1.0 and 2.0.

* NAICS codes converted to industry text by NIOSH

Coding results will vary and depend upon overall quality of the source data.  Structured and detailed data sources will have higher accuracy and production rates than data sources with long and complex text, unintelligible text, or insufficient information.

NIOCCS uses only the industry and occupation text to assign codes. Records that contain employer name and/or job duties will not code at the same rate of accuracy as records containing only industry and occupation. This is because the additional pieces of information (employer and job duties) can conflict and/or provide more detailed information that could alter the industry and occupation codes assigned. Including this information can be helpful however when using the computer-assisted coding module to ensure that appropriate codes are assigned manually.