Accession Number : AD0787841

Title :   Stably Updating Mean and Standard Deviation of Data.

Descriptive Note : Technical rept.,

Corporate Author : WASHINGTON STATE UNIV PULLMAN DEPT OF COMPUTER SCIENCE

Personal Author(s) : Hanson,Richard J.

Report Date : 06 JUN 1974

Pagination or Media Count : 11

Abstract : By considering the (sample) mean of a set of data as a fit to this data by a constant function, a computational method is presented based on a matrix formulation and Givens transformations. The (sample) mean and deviation can be updated as data accumulates. The procedure is numerically stable and does not require storage of the data. Methods for dealing with weighted data and data removal are presented. When updating the mean and square of the standard deviation the process requires no square roots. (Author)

Descriptors :   *Standard deviation, *Mean, *Computations, Analysis of variance, Least squares method, Matrices(Mathematics), Algorithms

Subject Categories : Statistics and Probability

Distribution Statement : APPROVED FOR PUBLIC RELEASE