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Disease definitions change over time because of new scientific evidence.
But diagnosis and disease definitions change all the time; today's is as likely to be proved 'wrong' as yesterday's.
If the definitions change, observed differences in student achievement may not reflect actual development but changes in the sample composition.
As research techniques change, operational definitions change, too.
These reflect socially and culturally defined roles for males and females [ 95] and will be corrected if and when these definitions change.
Table 2 shows regression equations for figure 2. Regression slopes indicate the magnitude of change in wasting prevalence when case definitions change from NCHS to WHO: severe wasting in infants under 6 months is 3.5 times greater and severe child wasting 1.7 times greater.
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Under President Clinton, definitions changed.
For comparability across survey years, where definitions changed between surveys, we selected broad ethnic categories (white, black, Asian, Chinese, or other).
By definition, change disturbs something or annoys someone.
All goals, by their very definition, change the balance of matches to some extent but this one was off the scale.
Definition change mostly reflected a scope transformation during this system development.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com