Statistical Analysis of Emissions and Deterioration Rates for In-Use, High-Mileage CNG and Gasoline Vehicles

摘要

This study compares emissions test results among seven compressed natural gas and seven standard gasoline 1996 Ford Crown Victoria taxi cabs. The study applies a mixed-effects analysis of covariance (ANCOVA) model on data from three rounds of high-mileage emissions tests performed at target odometer readings of 60,0000, 90,0000, and 120,000 nukes (i.e., 96,540, 144,810, and 193,080 km).