Radford compensation database results may be reported with percentiles to demonstrate the dispersion of data. Overall database results typically present data for the 10th, 25th, 50th, 75th and 90th percentiles as the default display. Custom Reports may use other values.
Each percentile value reflects the percentage of responses that fall below the indicated percentile. For example, the 50th percentile (or median) is the middle value in the sorted array. Half the responses are above the median value; half the responses are below the median value. In another example, seventy-fifth percent of salaries are lower than the salary reported as the 75th percentile.
A sample of twenty or more employees is required to present all the percentiles (90th through 10th). If the sample size is fewer than twenty, the percentiles above the 75th and below the 25th are suppressed. If one company provides more than 25 percent of the incumbents used to compute any data element, the calculated percentile values above the 75th and below the 25th are suppressed.