On Thu, 27 Mar 2008, Robert A LaBudde wrote:
> At 05:06 PM 3/26/2008, Ted Harding wrote:
>> On 26-Mar-08 21:26:59, Ala' Jaouni wrote:
>>> X1,X2,X3,X4 should have independent distributions. They should be
>>> between 0 and 1 and all add up to 1. Is this still possible with
>>> Robert's method?
>>>
Hi all
One suggestion, tranforme the x
00
u > or < ln()
(u1 & u2 are not independant)
Compute u3 given the above formula
Generate the x
Hope this help
Naji
Le 26/03/08 22:41, « Ala' Jaouni » <[EMAIL PROTECTED]> a écrit :
> X1,X2,X3,X4 should have independent distributions. They shoul
At 05:06 PM 3/26/2008, Ted Harding wrote:
>On 26-Mar-08 21:26:59, Ala' Jaouni wrote:
> > X1,X2,X3,X4 should have independent distributions. They should be
> > between 0 and 1 and all add up to 1. Is this still possible with
> > Robert's method?
> >
> > Thanks
>
>I don't think so. A whileago you wro
Ala' Jaouni gmail.com> writes:
>
> X1,X2,X3,X4 should have independent distributions. They should be
> between 0 and 1 and all add up to 1. Is this still possible with
> Robert's method?
>
NO.
If they add to 1 they are not independent.
As Ted remarked, the constraints define two simplexes an
OOPS! A mistake below. I should have written:
This raises a general question: Does anyone know of
an R function to sample uniformly in the interior
of a general (k-r)-dimensional simplex embedded in
k dimensions, with (k-r+1) given vertices?
On 26-Mar-08 22:06:54, Ted Harding wrote:
> On
On 26-Mar-08 21:26:59, Ala' Jaouni wrote:
> X1,X2,X3,X4 should have independent distributions. They should be
> between 0 and 1 and all add up to 1. Is this still possible with
> Robert's method?
>
> Thanks
I don't think so. A whileago you wrote
"The numbers should be uniformly distributed" (but
Ala' Jaouni wrote:
>
> I am trying to generate a set of random numbers that fulfill the
> following constraints:
>
> X1 + X2 + X3 + X4 = 1
>
> aX1 + bX2 + cX3 + dX4 = n
>
> where a, b, c, d, and n are known.
>
> Any function to do this?
>
You must give more information.
How are those numbers
X1,X2,X3,X4 should have independent distributions. They should be
between 0 and 1 and all add up to 1. Is this still possible with
Robert's method?
Thanks
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R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read t
X1,X2,X3,X4 should have independent distributions. They should be
between 0 and 1 and all add up to 1. Is this still possible with
Robert's method?
Thanks
On Wed, Mar 26, 2008 at 12:52 PM, Ted Harding
<[EMAIL PROTECTED]> wrote:
> On 26-Mar-08 20:13:50, Robert A LaBudde wrote:
> > At 01:13 PM 3/2
On 26-Mar-08 20:13:50, Robert A LaBudde wrote:
> At 01:13 PM 3/26/2008, Ala' Jaouni wrote:
>>I am trying to generate a set of random numbers that fulfill
>>the following constraints:
>>
>>X1 + X2 + X3 + X4 = 1
>>
>>aX1 + bX2 + cX3 + dX4 = n
>>
>>where a, b, c, d, and n are known.
>>
>>Any function
On Wed, Mar 26, 2008 at 7:27 PM, Ala' Jaouni <[EMAIL PROTECTED]> wrote:
> I failed to mention that the X values have to be positive and between 0 and
> 1.
Use Robert's method, and to do his step 1, use runif (?runif) to get
random numbers from the uniform distribution between 0 and 1.
Paul
___
You have 4 random variables that satisfy 2 linear constraints, so you
are trying to generate a point in a (4-2) = 2 dimensional linear
(affine, in fact) subspace of R^4.
If you don't have any further requirement for the distribution of the
random points you want to generate, there are infinitely
Hi,
I failed to mention that the X values have to be positive and between 0 and 1.
e.g.
0.1812*X1 + 0.1871*X2 + 0.1847*X3 + 0.2745*X4 + 0.1304*X5 = 0.2
so one possible combination of X values can be:
0.319, 0.201, 0.084, 0.26, 0.136
another possible combination:
0.151, 0.253, 0.197, 0.256, 0.14
At 01:13 PM 3/26/2008, Ala' Jaouni wrote:
>I am trying to generate a set of random numbers that fulfill the following
>constraints:
>
>X1 + X2 + X3 + X4 = 1
>
>aX1 + bX2 + cX3 + dX4 = n
>
>where a, b, c, d, and n are known.
>
>Any function to do this?
1. Generate random variates for X1, X2, based
I am trying to generate a set of random numbers that fulfill the
following constraints:
X1 + X2 + X3 + X4 = 1
aX1 + bX2 + cX3 + dX4 = n
where a, b, c, d, and n are known.
Any function to do this?
Thanks,
-Ala'
__
R-help@r-project.org mailing list
ht
I am trying to generate a set of random numbers that fulfill the following
constraints:
X1 + X2 + X3 + X4 = 1
aX1 + bX2 + cX3 + dX4 = n
where a, b, c, d, and n are known.
Any function to do this?
Thanks,
-Ala'
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