The nonparametric approach involves establishing the values falling at the and percentiles of the population as the lower and upper reference limits. The first step is to enter the analyte values in a spreadsheet and sort them in ascending order of magnitude. The number of values in the data set is then multiplied by and to obtain the percentile ranks of the upper and lower reference limits, respectively. For example, if the data set consisted of 120 specimens, the and percentile ranks would be calculated by multiplying;
Barbara is only six years older than I, but in terms of the influence she’s had on my life she might as well have been my mother. She was an honors student in high school and studied Spanish for five years. As a thirteen year old, I often went with her to a special program run by our church that helped Hispanic immigrants learn to speak English. I watched Barbara take a deep interest in the lives of many of the people there. Sometimes she would bring me home, only to go back and spend additional hours helping old and young alike with their personal problems. By example, Barbara taught me not only the value of helping others, but the importance of loyalty and commitment.