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Pages 85-87

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From page 85...
... 85 A P P E N D I X F The functional form of the regression model sets the relationship between the explanatory and dependent variable. An incorrect functional form results in biased and inconsistent parameter estimates from which a CMF is derived, so it stands to reason that the selection of a functional form is critical to developing a reliable CMF.
From page 86...
... 86 Development of Crash Modification Factors for Uncontrolled Pedestrian Crossing Treatments For most of the variables available and for all those included in the final models, the structure of the variables was categorical, e.g., Area Type is either rural or urban, and not continuous. Thus, for these variables, the ID method is not relevant and was not applied.
From page 87...
... Selection and Assessment of Model Form for Cross-Sectional Models 87 • Step 5: For each site, calculate the cumulative squared residuals, s2(n)

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