Title of article :
The importance of confounding in observational before-and-after studies of road safety measures
Author/Authors :
Rune Elvik، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2002
Keywords :
Before-and-after study , Road safety measure , validity , confounding
Journal title :
Accident Analysis and Prevention
Journal title :
Accident Analysis and Prevention