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Im still eagerly awaiting ANY reponse (even from Jane and Ron) to these recently forwarded questions ( Re:Allstat 30th October). I suspect this kind of 'spatial statistical handle' to what is essentially a dynamical description is, in fact, very common. I shall happily display all answers received. Any offers? Thanks again, Eric Grist ----------------------------------------------------------------- (1) Suppose I have a FLAT finite 2 dimensional region and take S samples from different (point) sites at t different times for t=1,2,3..n BOTH the location AND number of samples taken at each time step t will in general be different (ie change in time). What statistic(s) would best give a measure of how the spatial arrangment of the sampling regime changes at each time step in:- (a) a relative sense (the points may be translated) (b) an absolute sense (relative to some fixed reference frame)? For example, the samples might be the temperatures of a tank of fluid at different surface locations respectively (a) not taking into account the sampling locations relative to the tank bottom, (b)taking into account sampling locations relative to the tank bottom. (2) Question (1) again but now with the samples taken 3 dimensionally ie not confined to the fluid surface. (3) Suppose I have a continuous finite 2 dimensional surface within fixed boundaries which changes in shape at times t=1,2,3,..n (for example the membrane of a drum). What statistic(s) would be be used to measure how much the overall shape changes at each time step? All comments and suggestions are very welcome. Many thanks, Eric Grist ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%