has_specified_output achieves_planned_objective dataset creating center value descriptive statistical calculation objective median calculation A median calculation is a descriptive statistics calculation in which the midpoint of the data set (the 0.5 quantile) is calculated. First, the observations are sorted in increasing order. For an odd number of observations, the median is the middle value of the sorted data. For an even number of observations, the median is the average of the two middle values. From Monnie's file comments - need to add center_calculation role but it doesn't exist yet - (editor note added by James Jan 2008) James Malone Monnie McGee PERSON: James Malone PERSON: Monnie McGee median calculation center calculation objective center calculation data transformation descriptive statistical calculation data transformation metadata complete