- noun one of a series of three figures below which 25 per cent, 50 per cent or 75 per cent of the total falls
- noun one of three figures below which 25 per cent, 50 per cent or 75 per cent of a total falls, or each of the four groups separated by these figures. The word is used in relation to a frequency distribution, such as the amount of turnover attributable to each customer. It is more common to refer to the upper and lower quartiles (below 25 per cent and above 75 per cent) than to other quartiles.
(written as Quartile)When a continuous variable is split for convenience into four equal-sized chunks of data the cut-off points between them are called quartiles.