The reaction time distributions for each individual in a moderately large sample of adults were analyzed in terms of percentiles
, and then each reaction time percentile
was correlated with a number of cognitive variables and with age.
In an intermediate order-statistics book, David (1981) elaborated the computation of percentile
for continuous and discrete distributions.
Intelligence quotient and achievement test scores were converted to percentile
ranks and were plotted on the assessment profile (see Figure 1).
Therefore, efforts should be made to follow children at or above the 50th percentile
at yearly physical exams so unhealthy weight gain patterns can be identified and intervened upon early--before they become problematic," Dr.
Only 4% of the girls who were below the 50th percentile
in adolescence became overweight or obese by follow-up, while 26% of the boys initially below the 50th percentile
became overweight or obese.
Overall, the district's first-graders scored at the 56th percentile
in reading and spelling, the 47th percentile
in math and 46th percentile