Roberts. S. W. (2000, ASQ and American Statistical Association) Bell Telephone Laboratories
[This abstract is based on the author's abstract.] A geometric moving average gives the most recent observation the greatest weight. The weights of all previous observations decrease in geometric progression from the most recent back to the first. A graphical procedure for generating geometric moving averages is described in which the most recent observation is assigned a weight. The properties of control chart tests based on geometric moving averages are compared to tests based on ordinary moving averages.
Control charts,Geometric Moving Average (GMA) charts,Statistical weights,Testing,Moving average chart