Transportation Statistics and Microsimulation

26    ◾    Transportation Statistics and Microsimulation

2.9 CONCLUDING REMARKS

As previously stated, it is the authors’ belief that the rst step in any

statistical analysis for transportation applications is to graph the data.

Unfortunately, it is not always clear what form should be used rst, and

for this reason, it may be necessary to try dierent graphing types. e

main goal, of course, is to develop a greater understanding of the data

through the use of graphs. is comprehension might be of the relation-

ships between the various variables (e.g., speed and volume), the nature of

the data (type of pdf), whether the data ...