APPROACHES TO ANALYZING DATA FROM THE PORTLAND STUDY, TASK 4

The EPA is currently conducting the Short Test Correlation and Effectiveness Study (Portland Study), a large-scale emission testing program, in Portland, Oregon. For all the vehicles involved in the study, vehicle emissions are measured by three short tests (STs) at a state inspection station and by the three tests plus the Federal Emission Certification Test Procedure (FTP) at an emission testing laboratory. The two basic areas of interest in the Portland Study are: (1) the issue of association of short-test emissions (as measured in a real-world inspection/ maintenance environment) and FTP emissions; and (2) theoretical and practical questions concerning the process of inspection and maintenance. The purpose of this report is to provide various sound statistical procedures that could be used in analyzing data from the Portland Study.

  • Corporate Authors:

    Technology Service Corporation

    2811 Wilshire Boulevard
    Santa Monica, CA  United States  90403

    Environmental Protection Agency

    2565 Plymouth Road
    Ann Arbor, MI  United States  48105
  • Authors:
    • Lai, LSL
    • Gins, J D
  • Publication Date: 1979-5

Media Info

  • Pagination: 181 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00318040
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: TSC-PD-A158-5 Final Rpt.
  • Contract Numbers: EPA-68-03-2392
  • Files: TRIS
  • Created Date: Jul 22 1980 12:00AM