means capturing underlying properties of systems according to natural law. According to Campbell measurement is based on an empirically tested theory. Stevens’s scientific measurement definition, ‘assignment of numerals to objects of events according to any rule’, (Godfrey et al., 2010, p. 134) is less rigorous than Campbell’s. According to Stevens, the theory is not critical for the measurement to take place. Therefore, to meet his definition, it is not necessary that the alignment of the numbers…
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