Related Positional Measures
Besides median, there are other measures which divide a series into equal parts. Important amongst these are quartiles, deciles and percentiles.
Quartiles are those values of the variate which divide the total frequency into 4 equal parts, deciles divide the total frequency into 10 equal parts and the percentiles divide the total frequency into 100 equal parts.
The quartiles are denoted by symbol Q, deciles by D and the percentiles by P. Graphically, any set of these partition values divides the area of the frequency curve on histogram into equal parts.