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Summary of variability
Relation of variability to the grade concept
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20-year period ability groups achievement tests age group age seven annual percentage rate census division cent Central Europe chronological age classification clerical occupations clerks and kindred decline decrease distribution domestic and personal Education figures foreign-born foremen gainfully employed persons gainfully occupied group at age high group iOvO keepers laborers LL.B LL.D low group manual occupations manual workers manufacturing and mechanical mechanical industries median mental age ninetieth percentile occupation groups occupational division occupational trends Ovoo percentage Percentile range population production occupations Professional persons professional service proportion of women proportionate representation public service pupils quartile quota racial groups rate of growth rate of increase rOvO second decade semiskilled seven-year-olds skilled social-economic groups Stanford Achievement Stanford Achievement tests subgroup supervisory districts ten-year-olds tion transportation and communication unskilled variability white-collar and proprietary whole communities women workers York York City