Ordinal measurements have imprecise differences between consecutive values, but have a meaningful order to those values, and permit any order-preserving transformation. Nominal measurements do not have meaningful rank order among values, and permit any one-to-one transformation. The psychophysicist Stanley Smith Stevens defined nominal, ordinal, interval, and ratio scales. Various attempts have been made to produce a taxonomy of levels of measurement. In this case, the researchers would collect observations of both smokers and non-smokers, perhaps through a cohort study, and then look for the number of cases of lung cancer in each group. This type of study typically uses a survey to collect observations about the area of interest and then performs statistical analysis. Those in the Hawthorne study became more productive not because the lighting was changed but because they were being observed. View all.The Hawthorne effect refers to finding that an outcome (in this case, worker productivity) changed due to observation itself.
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