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MathGroup Archive 1994

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3D smoothing

  • To: MathGroup <mathgroup at yoda.physics.unc.edu>
  • Subject: 3D smoothing
  • From: Tapio Luttinen <100013.2275 at compuserve.com>
  • Date: 04 Jan 94 15:57:31 EST

Dear Mathgroupers,

Does anyone have a good 3D smoothing package? I have several probability 
density estimates for vehicle headways at different flow levels. Now I want 
to make a surface plot of the densities across the volumes. I tried 
distance weighted least squares (of Systat), but that produced saddle 
points in the peak at unobserved flow rates.

The density starts from zero, increases steeply to maximum and then 
decreases exponentially. The mode is constant at different flow rates, but 
peak height increases as the flow increases.

Any help appreciated

R. Tapio Luttinen

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