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If reported differences are not only related to differences in true health, they are likely to depend also on variations in the interpretation of the categories.
Therefore, by matching examinees on the conditioning variable and then summarizing the differences in performances over these levels, DIF methods correct for differences in true mean target ability between the focal and reference groups.
In this respect, Jürges's (2007) cross-national differences in self-reported health tend to be higher than the differences in true health (measured by diagnosed conditions), while the degree of dissonance between the two is different among countries, with Danish and Swedish having a tendency to overrate their health statuses compared with Germans, for example, who have a tendency to underrate it.
Our correction additionally assumes that clinic-level variation in Campylobacter incidence is entirely due to ascertainment differences rather than differences in true incidence.
Therefore, sex differences in "true" cerebral vasodilator capacity, when accounting for baseline flow velocity and acute changes in blood pressure, and their underlying mechanisms are unclear.
This variability may be due to differences in measurement instruments or methods [ 11], biological differences in true range of movements, or errors in measurements.
Similar(40)
Overall, we detected little difference in true nutrient digestibility; however, SSG and MIX provided the lowest acetate to propionate ratio and lower CH4 output than MIL and ORD.
In Toft et al. 2005 [ 26], the importance of the difference in true prevalence was examined.
The SDD is the smallest difference between two subjects that can, with 95% confidence, be attributed to a real difference in true scores.
The higher the VAS score (from 50 and up), the larger the difference in true HRQL (measured horizontally in figure 4) for a given difference in VAS (measured vertically).
This difference in true polyandry was not detected in the Greek flies (7.5%, 3.8% and 5.7% at 18°C, 21°C and 25°C respectively; Pearson's Chi-squared test, χ2 = 1.064, p = 0.588).
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