The Effects of Commercial Electronic Variable Message Signs ...

Variable Ref. # Advantages Disadvantages
4.3.3 Before/after with
control
4.3.4 Before/after/before More convincing causal
effect.
4.3.5 Regression model Directly account for
multiple factors
4.3.6 Empirical Bayes Control for regression
toward mean.
4.3.7 Full Bayes More complete treatment of
conditional probabilities.
Control adds rigor. Regression toward mean.
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Regression toward mean.
Large amounts of data on
many variables
More complicated statistical
model.
Not widely used.