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The of number of Americans who are focused on status , materialism and risk-taking nearly doubled during the 1990s , from 16 to 31 percent . Instead , the sums of allelic frequencies in cohorts comprised of persons with and without the disease are determined and a statistical test is applied to discover if the difference in sums observed is greater than would be expected by chance . The aim is not only to increase the sum of raw source material online , but also to make access to that material cheaper and easier ... We apply this concept to characterize when the direct sum of bent functions is normal , and we prove that the direct sum of a normal and a non-normal bent function is always non-normal . " The sum of experiences like these has changed Schulz .