Pfarr, Christian; Schmid, Andreas; Schneider, Udo - In: Journal of Economics and Econometrics 54 (2011) 1, pp. 7-23
Estimation procedures for ordered categories usually assume that the estimated coefficients of independent variables do not vary between the categories (parallel-lines assumption). This view neglects possible heterogeneous effects of some explaining factors. This paper describes the use of an...
