Research outputs 1998, Statistica Sinica, 8, 1045-1058 Type: article Danny Pfeffermann, Chris Skinner & Keith Humphreys, 1998, Journal of the Royal Statistical Society: Series A (Statistics in Society), 161(1), 13-32 DOI: Type: article 1993, Statistica, 53, 391-405 Type: article 1991 Type: bookChapter