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Weibull scale and shape parameters swapped


From: John W. Eaton
Subject: Weibull scale and shape parameters swapped
Date: Thu, 31 Dec 2009 19:03:02 -0600

On  4-Nov-2009, Muhali wrote:

| I'm not sure if this is a bug as it only affects naming conventions of the
| help text: The weibull functions have shape and scale parameters mixed up.
| 
| -- Function File:  weibull_cdf (X, SHAPE, SCALE)
|      Compute the cumulative distribution function (CDF) at X of the
|      Weibull distribution with shape parameter SCALE and scale
|      parameter SHAPE, which is
| 
|           1 - exp(-(x/shape)^scale)
| 
|      for X >= 0.

What version of Octave are you using?  In 3.0 and later, the weibull_X
(X = cdf, ...) functions are deprecated.  The correct functions to use
are called wblX instead.  I think those functions have arguments that
are ordered in a way that is correct and compatible with Matlab.

If you think you've found a bug, please send a complete report to the
address@hidden list.

jwe


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