Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Incomplete Matching in Ex Post Facto Studies

Ronald Freedman
American Journal of Sociology
Vol. 55, No. 5 (Mar., 1950), pp. 485-487
Stable URL: http://www.jstor.org/stable/2772105
Page Count: 3
  • Read Online (Free)
  • Download ($14.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Incomplete Matching in Ex Post Facto Studies
Preview not available

Abstract

In every ex post facto matched-group study a large proportion of the cases in the experimental group are not matched bacause of the limited size of the control panel. This introduces a serious sampling problem, since the difference between experimental and matched group may not be the same for cases matched easily as for those for which matching is difficult. Data are presented to demonstrate that educational differences between matched groups of migrants and nonmigrants are statistically significant when 58 per cent of the original experimental group is matched but not when 89 per cent of the cases is matched.

Page Thumbnails

  • Thumbnail: Page 
485
    485
  • Thumbnail: Page 
486
    486
  • Thumbnail: Page 
487
    487