Contingency Factors to Account for Risk in Early Construction Cost Estimates for Transportation Infrastructure Projects (2022)

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E-1   Goodness-of-fit Test Results A P P E N D I X E Distribution Roadway New Construction Roadway Reconstruction Roadway Resurfacing Roadway Rehabilitation Bridge Replacement Bridge Rehabilitation Normal <0.005 0.110 0.018 0.023 <0.010 0.044 Lognormal 0.033 0.064 0.055 0.052 0.206 0.061 Exponential <0.003 <0.003 <0.003 0.021 <0.003 <0.003 2-parameter Exponential <0.010 0.042 <0.010 <0.003 0.072 0.045 Weibull <0.010 0.145 <0.010 <0.010 0.037 <0.010 3-parameter Weibull 0.366 0.227 0.095 0.076 0.191 >0.500 Gamma 0.018 0.018 0.021 0.040 0.052 0.053 3-parameter Gamma 0.012 0.108 0.009 0.009 0.040 0.074 Loglogistic 0.014 0.081 0.014 0.014 0.136 0.053 3-parameter Loglogistic 0.049 0.071 0.043 <0.010 0.078 0.077 Note: Bolded numbers indicate the largest values for project types. Table E-1. Goodness-of-fit test results.