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runningstat runningstat runningstat php implementations of online statistical algorithms loading searching no matches runningstat runningstat computes the central tendency shape and extrema of a set of points online in constant space it uses a neat one pass algorithm for calculating variance described here https en wikipedia org wiki algorithms_for_calculating_variance on line_algorithm this particular implementation adapts a sample c implementation by john d cook to php see also http www johndcook com standard_deviation html http www johndcook com skewness_kurtosis html runningstat instances can be combined the resultant runningstat has the same state it would have had if it had been used to accumulate each point this property is attractive because it allows separate threads of execution to process a stream in parallel more importantly individual points can be accumulated in stages without loss of fidelity at intermediate points in the aggregation process javascript profiling samples can be accumulated in the user s browser and be combined with measurements from other browsers on the profiling data aggregator functions that are called multiple times in the course of a profiled web request can be accumulated in mediawiki prior to being transmitted to the profiling data aggregator usage here is how you use it use wikimedia runningstat rstat new runningstat foreach 49 7168 74 3804 7 0115 96 5769 34 9458 36 9947 33 8926 89 0774 23 7745 73 5154 86 1322 53 2124 16 2046 73 5130 10 4209 42 7299 49 3330 47 0215 34 9950 18 2914 as sample rstat addobservation sample printf n d min 2f max 2f mean 2f variance 2f stddev 2f n count rstat rstat min rstat max rstat getmean rstat getvariance rstat getstddev output n 20 min 7 01 max 96 58 mean 47 59 variance 725 71 stddev 26 94 wikimedia runningstat compute running mean variance and extrema of a stream of numbers definition runningstat php 36 license gpl 2 0 or later generated by 1 10 0