R help - Feb 2011 - Joiny probability with R

Hi,
    I have two vector with the marginal distribution like
this:
> a
[1] -0.419 -0.364 -0.159 -0.046 -0.010 -0.002  0.000  0.000 
0.000
> b
[1] 0.125 0.260 0.270 0.187 0.097 0.041 0.014 0.004 0.001

How can I calculate the joint distribution with R?

Thank you to all
Dan
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On Feb 19, 2011, at 5:47 AM, danielepippo wrote:
>
> Hi,
>    I have two vector with the marginal distribution like this:
>> a
> [1] -0.419 -0.364 -0.159 -0.046 -0.010 -0.002  0.000  0.000  0.000
>> b
> [1] 0.125 0.260 0.270 0.187 0.097 0.041 0.014 0.004 0.001
>
> How can I calculate the joint distribution with R?
Marginal distributions do not uniquely determine the joint  
distribution, Furthermore, the first one doesn't even look like a  
distribution or even a density. Densities are positive and CDFs range  
from 0 to 1. (The second on could be a discrete density for some set  
of values.) So you need to explain where those numbers come from and  
why you think we should apply sort of "distributional" assumptions  
about them.

--

David Winsemius, MD
West Hartford, CT