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MathGroup Archive 2004

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Re: populate a list with random numbers from normaldistribution?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49904] Re: [mg49855] populate a list with random numbers from normaldistribution?
  • From: sean kim <sean_incali at yahoo.com>
  • Date: Thu, 5 Aug 2004 09:22:22 -0400 (EDT)
  • Reply-to: sean_incali01 at yahoo.com
  • Sender: owner-wri-mathgroup at wolfram.com

Hi tomas

What I wanted to do is to pick sets of random Integers
in the ranges {10000, 99999} from the Normal
distribution such that, the mean is 50000 and the
standard deviation is 25000. 

or is that not normal distribution? will that be a
custom distribution? 

if that isn't possible, then I want to pick set of
random intgers ranging from {10000, 99999} such that
the variance and the mean and standard deviation do
not change across different runs. 

I think i'm supposed to use SeedRandom here but this
caused me problems also. 

so I need to design a routine that will pick random
integers in a given range with a given distribution
with the SAME mean, std dev/ and variances across
different runs or simulations. 

any insights will be truly appreciated.


sean 



> > l1 = Table[Random[NormalDistribution[50000,25000],
> Integer, {10000, 99999}], {1000}];

--- Tomas Garza <tgarza01 at prodigy.net.mx> wrote:

> Check your syntax. Look at the following:
> 
> In[1]:=
> << "Statistics`"
> 
> In[2]:=
> dist = NormalDistribution[50000, 25000];
> 
> In[4]:=
> Table[Random[dist], {10}]
> Out[4]=
> {26975.950556122647, 58550.03432245862,
>   90456.47272543506, 73888.28476391576,
>   52046.50992913155, 72675.80052590193,
>   48593.27989475152, 78918.83089186646,
>   96303.52480806905, 69543.82643195332}
> 
> What, then, do you mean by the variance of the above
> table?
> 
> Tomas Garza
> Mexico City
> ----- Original Message ----- 
> From: "sean kim" <sean_incali at yahoo.com>
To: mathgroup at smc.vnet.net
> To: <mathgroup at smc.vnet.net>
> Sent: Wednesday, August 04, 2004 9:46 AM
> Subject: [mg49904] [mg49855] populate a list with random
> numbers from normal
> distribution?
> 
> 
> > hello group.
> >
> > I looked at the help browser but i can't figure
> this out. I weant to
> > make a list of random numbers sampled from a
> normal distribution
> >
> > In[90]:=
> Needs["Statistics`ContinuousDistributions`"]
> >
> > l1 = Table[Random[NormalDistribution[50000,25000],
> Integer, {10000,
> > 99999}], {1000}];
> >
> > Variance[l1]//N
> > StandardDeviation[l1]//N
> >
> >
> > From In[90]:=
> > Random::"randt":
> > Type specification NormalDistribution[50000,
> 25000] in
> > <<1>> should be Real, Integer, or Complex.
> >
> > Out[92]=
> > 0.
> > Out[93]=
> > 0.
> >
> > thanks in advance for any insights
> >
> > sean
> >
> >
> 
> 
> 





		
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