R help - Nov 2009 - How to use results of distribution fitting for further processing?

This is probably simple, but I have a hard time finding the solution. Any help
greatly appreciated.
 
I would like to use the results of
fitdistr(z,densfun=dweibull,start=list(scale=1,shape=1)) for further
processing.  How do I assign the values of scale and shape to b and a without
manually entering the numbers?
 
TIA


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Raymond Wong wrote:
> This is probably simple, but I have a hard time finding the solution. Any
help greatly appreciated.
>  
> I would like to use the results of
fitdistr(z,densfun=dweibull,start=list(scale=1,shape=1)) for further processing.
How do I assign the values of scale and shape to b and a without manually
entering the numbers?
fd <- fitdistr(z,densfun=dweibull,start=list(scale=1,shape=1))
str(fd)
fd$estimate
fd$estimate[1]

etc

Remember the ever useful str().

  -Peter Ehlers

>  
> TIA
> 
> 
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> Looking for the perfect gift? Give the gift of Flickr! 
> 
> 
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> 
> 
> 
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On Nov 20, 2009, at 1:47 PM, Peter Ehlers wrote:
>
>
> Raymond Wong wrote:
>> This is probably simple, but I have a hard time finding the  
>> solution. Any help greatly appreciated.
>> I would like to use the results of  
>> fitdistr(z,densfun=dweibull,start=list(scale=1,shape=1)) for  
>> further processing.  How do I assign the values of scale and shape  
>> to b and a without manually entering the numbers?
>
library(MASS)
> fd <- fitdistr(z,densfun=dweibull,start=list(scale=1,shape=1))
> str(fd)
> fd$estimate
> fd$estimate[1]
>
> etc
>
> Remember the ever useful str().
Agree! You cannot learn R without knowing to use str().

Could also get more self-documenting code with:

fd$estimate[c("scale", "shape")]

-- 
David
>
> -Peter Ehlers

David Winsemius, MD
Heritage Laboratories
West Hartford, CT