New submission from Raymond Hettinger <raymond.hettin...@gmail.com>:
It is a common and useful data analysis technique to examine quartiles, deciles, and percentiles. It is especially helpful for comparing distinct datasets (heights of boys versus heights of girls) or for comparing against a reference distribution (empirical data versus a normal distribution for example). --- sample session --- >>> from statistics import NormalDist, quantiles >>> from pylab import plot # SAT exam scores >>> sat = NormalDist(1060, 195) >>> list(map(round, quantiles(sat, n=4))) # quartiles [928, 1060, 1192] >>> list(map(round, quantiles(sat, n=10))) # deciles [810, 896, 958, 1011, 1060, 1109, 1162, 1224, 1310] # Summarize a dataset >>> data = [110, 96, 155, 87, 98, 82, 156, 88, 172, 102, 91, 184, 105, 114, 104] >>> quantiles(data, n=2) # median [104.0] >>> quantiles(data, n=4) # quartiles [91.0, 104.0, 155.0] >>> quantiles(data, n=10) # deciles [85.0, 88.6, 95.0, 99.6, 104.0, 108.0, 122.2, 155.8, 176.8] # Assess when data is normally distributed by comparing quantiles >>> reference_dist = NormalDist.from_samples(data) >>> quantiles(reference_dist, n=4) [93.81594518619364, 116.26666666666667, 138.71738814713967] # Make a QQ plot to visualize how well the data matches a normal distribution # plot(quantiles(data, n=7), quantiles(reference_dist, n=7)) ---------- components: Library (Lib) messages: 339544 nosy: rhettinger priority: normal severity: normal status: open title: Add quantiles() to the statistics module type: enhancement versions: Python 3.8 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue36546> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
