Updating Mean and Variance Estimates: An Improved Method A method of improved efficiency is given for updating the mean and variance of weighted sampled data when an additional data value is included in the set. Evidence is presented that the method is stable and at least as accurate as the best existing updating method. CACM September, 1979 West, D. Mean, standard deviation, variance, updating estimates, removing data 5.5 5.19 CA790908 DB January 16, 1980 4:47 PM 2731 4 3167 3159 4 3167 3159 4 3167 3166 4 3167 3166 4 3167 3167 4 3167 3167 4 3167 3167 4 3167 2731 5 3167 2799 5 3167 3166 5 3167 3167 5 3167 3167 5 3167 3167 5 3167 1411 6 3167 2731 6 3167 2799 6 3167 3159 6 3167 3167 6 3167