Transportation Statistics and Microsimulation

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8Chapter

Other Inferential

Procedures

ANOVA and Distribution-Free Tests

8.1 INTRODUCTION

Transportation researchers oen have to compare many possible inter-

vention strategies. For example, they may question whether it is better

to use a sign that reads “slower trac keep right,” a sign that reads “le

lane for passing,” or some combination of both. A natural solution may be

to compare dierent combinations of these options and examine which

gives the better result. It is the transportation analyst’s role to compare the

results of the dierent combinations. In this chapter, we explain analy-

sis of variance (ANOVA), an oen-used technique