Re: Problem with Distribution Functions
- To: mathgroup at smc.vnet.net
- Subject: [mg84803] Re: Problem with Distribution Functions
- From: Bill Rowe <readnewsciv at sbcglobal.net>
- Date: Tue, 15 Jan 2008 03:14:51 -0500 (EST)
On 1/14/08 at 6:50 AM, stephan.heckmueller at gmx.net (Stephan Heckmueller) wrote: >Hello, I have a little problem with Mathematica's statistical >distributions. These seem not to be evauluated properly. For example >the documentation says that Variance[GammaDistribution[a,b]] should >be evaluated to ab^2. In my worksheets I simply get: >Variance[GammaDistribution[a,b]]. There are no errors or warnings >whatsoever. >Is there some package missing do I have to call the needs function >in advance? You didn't specify what version of Mathematica you are using. I assume it isn't version 6 since In[1]:= Variance@GammaDistribution[a, b] Out[1]= a b^2 In[2]:= $Version Out[2]= 6.0 for Mac OS X PowerPC (32-bit) (June 19, 2007) Earlier versions require loading the package Statistics`ContinuousDistributions` before attempting to evaluate Variance. -- To reply via email subtract one hundred and four