About this article
Published Online: Feb 14, 2014
Page range: 163 - 166
DOI: https://doi.org/10.2478/jos-2014-0009
This content is open access.
Edith de Leeuw
Department of Methodology and Statistics Faculty of Social and Behavioral Sciences Utrecht University PO Box 80.140 NL-3508 TC Utrecht the Netherlands Telephone: þ31 (0)30 253 4438