Lean Startup, Mathematical Modeling, Applied Mathematics, Metrics.
used and often misleading descriptive statistic: the simple average. Each of the following groups have the same average, i.e. 10: {4,12,18,12,4} {10,10,10,10,10} {25,0,0,0,25} {-10000, 3, 1942,8497,-392}. Clearly without an indication that the data fits into some pattern or model that makes the