CompGroup: CompGroup
In rnorberg/bastudy: A Package for Before and After Traffic Studies

Description Usage Arguments Details Value Author(s) Examples

Calculates Crash Modification Factor (CMF) for a before/after traffic study using Comparison Method

1	CompGroup(compBefore, compAfter, before, after, depVar, alpha = 0.95)

`compBefore`	Comparison data in before period
`compAfter`	Comparison data in after period
`before`	Treatment data, before some change was made
`after`	Treatment data, after some change was made
`depVar`	The dependent variable (the number of crashes - should always be of class integer or numeric).
`alpha`	Level of confidence

None at this time

Returns a list object containing the CMF, its variance, standard error, and 1-alpha/2 CI

Jung-han Wang and Robert Norberg

data(compBefore)
data(compAfter)
data(Before)
data(After)
CompGroup(compBefore = compBefore, compAfter = compAfter, before = Before, after = After,
 depVar = "kabco")