| To: | s-news@lists.biostat.wustl.edu |
|---|---|
| Subject: | rfsim problem |
| From: | john walter <jfwalter@vims.edu> |
| Date: | Wed, 31 Mar 2004 18:47:54 -0500 |
|
please disregard the previous message. Like when I call the mechanic to
fix my broken car, only to find out that the battery wires aren't
connected, I found a programming error that caused the problem.
I have a problem with the SPLUS spatial stat function rfsim where when I create data sets larger than 10x10 or 100 data points, the function induces a trend in the simulated data. Simulated data values in the lower left of the created data set slope down to low values, resulting in a situation where the data set no longer possess a variogram resembling the one that created it. Does anyone know if this is a problem within rfsim or whether this is a numerical problem with the LU decomposition of the covariance matrix? Either way is there a better way to create a spatially autocorrelated dataset larger than 10x10? Thanks John Virginia Institute of Marine Science P.O. Box 1346 Gloucester Point, VA 23062 (804) 684-7316 jfwalter@vims.edu John Walter
Virginia Institute of Marine Science
P.O. Box 1346
Gloucester Point, VA 23062
(804) 684-7316
jfwalter@vims.edu
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