Lumsden, James2011-02-092011-02-091980Lumsden, James. (1980). Variations on a theme by Thurstone. Applied Psychological Measurement, 4, 1-7. doi:10.1177/014662168000400101doi:10.1177/014662168000400101https://hdl.handle.net/11299/99948A test model based on the Thurstone judgmental model is described. By restricting various parameters of the model, 3 Rasch models, 2 pseudo-Rasch models, 3 two-parameter ICC models, and a Weber’s Law model are derived.enArticle