One suitable example of an (ID) trend may be obtained for the Cauchy
distribution. Since you are probably primarily interested in the trend
over the positive domain, choosing, for instance, (1,.2) or (.3,.1) for
the (location,scale) parameters of the Cauchy distribution should give you
a desired result.
Zdenek Valenta
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Dept. of Biostatistics
303 Parran Hall, 130 DeSoto St
University of Pitsburgh, PA 15261
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