With a percentile rank of 50, he or she is in the middle of the group, while 100 indicates being at the top of the group. The chart below (called a“cumulative distribution map”) shows the correspondence between scaled scores and percentile ranks. By using this chart and scaled ...
used expressions of coefficient alpha and argues that while these expressions are correct when estimating reliability for summed scores, they are not appropriate to extend coefficient alpha to correctly estimate the reliability for nonlinearly transformed scaled scores such as percentile ranks and stan...