摘要
When reporting the prevalence of childhood obesity in the USA a few years ago,the magazine U.S.News & World Report stated: "...some 17 percent of kids are now obese,which means they’re at or above the 95th percentile for weight in relation to height for their age;an additional 17 percent are overweight, or at or over the 85th percentile." Anyone with some basic training in measurement or statistics will realize that this statement is incorrect.This is because the percentile is defined as the value below which a certain percent of observations fall in a population.For example,the
