United States Department of Justice. Office of Justice Programs. Bureau of Justice Statistics. Census of Publicly Funded Forensic Crime Laboratories, 2014. ICPSR36759-v1. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2017-04-19. https://doi.org/10.3886/ICPSR36759.v1
Persistent URL: https://doi.org/10.3886/ICPSR36759.v1
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Because the CPFFCL data collection was a census with no sampling, each crime lab was initially self-representing and had a design weight of 1. BJS developed weighting class adjustments for the 2002, 2005, 2009, and 2014 CPFFCL data to compensate for unit nonresponse and reduce nonresponse bias.
Sixteen subpopulations of labs were stratified into groups by crossing four categories of jurisdiction (federal, state, county, and municipal) and four categories of staff size (9 or fewer, 10 to 24, 25 to 49, and 50 or more). A seventeenth stratum was assigned to the FBI crime laboratory, given its unique size of more than 500 employees. Within each of the subgroups, statistical weights were applied to the data from the crime labs that responded to the census to allow their responses to represent the labs that did not respond.
To generate national estimates, BJS created imputed variables (IMP) to account for missing data among labs that did not respond to either the entire CPFFCL questionnaire (unit-level response) or certain questions (item-level response. For more information on weights and methods for producing national estimates, please see the codebook.
Mode of Data Collection:
Of the 409 eligible crime labs that received the questionnaire, 360 (88%) provided responses to at least some of the items. Of the 360 respondents, 351 (98%) completed the questionnaire through the automated web system.
Extent of Processing: ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of
disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major
statistical software formats as well as standard codebooks to accompany the data. In addition to
these procedures, ICPSR performed the following processing steps for this data collection:
Checked for undocumented or out-of-range codes.