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Therefore, disparity ratios below 100% suggest that the particular demographic group is underutilized. Table 4-10: Disparity Ratios by Demographic Group presents the overall disparity ratios calculated by the study authors:
Black
Hispanic
Asian
Native American
White Women
MWBE
Non- MWBE
Disparity Ratio
70.4%
86.8%
29.3%
294.5%
116.8%
102.4%
99.6%
It is important to note that the study authors recognized that especially high concentration of a group within a narrow range of NAICS codes and especially strong performance by one or two firms within such a group may be at odds with the performance of most firms in that group. Accordingly, additional analysis is presented by the study authors in Tables 4-11 through 4-13.
Of particular note is Table 4-12 which presents the disparity ratios when client services contracts are excluded from the analysis. Table 412: Disparity Ratios by Demographic Group (without Client Services) shows:
Black
Hispanic
Asian
Native American
White Women
MWBE
Non- MWBE
Disparity Ratio
2.5%
110.1%
29.9%
310.3%
79.8%
71.3%
105.3%
Additional information about the methodology used by the study authors is available in Chapter Three, Model Disparity Study , of the Transportation Research Board of the National Academy of Sciences, NCHRP Report 644, Guidelines for Conducting a Disparity and Availability Study for the Federal DBE Program (2010)
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