N-tiles are groupings of equal sized segments of customers that have been ranked and grouped into 100 Centiles, 20 Vigintiles, 10 Deciles, 5 Quintiles, 4 Quartiles, or 2 Semitiles. Grouping by N-tiles makes it easier to compare customer segments. When properly done, a disproportionate share of the Gross Sales, LTV, and Profit will come from customers in the top N-tiles, leaving the money-losing customers at the bottom.