R help - Feb 2012 - Weibull Distribution

Hi,

I want to estimate parameter of weibull distribution using mle for below
density function,
The PDF is,
f(x) = b a^-b x^(b-1)  exp -(x/a)^b  

In R ,density of the weibull distribution is,
f(x) = (a/b) (x/b)^(a-1) exp(- (x/b)^a)

which is different from my density,

I trying to estimate mle parmeter from R using fitdistr and fitdist
functions.
Can anyone tell me whatever parameter estimated from R are correct for my
density function or not?

Thanks 
Yogendra

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Hello,
>
> I want to estimate parameter of weibull distribution using mle for below
> density function,
> The PDF is,
> f(x) = b a^-b x^(b-1)  exp -(x/a)^b  
> 
> In R ,density of the weibull distribution is,
> f(x) = (a/b) (x/b)^(a-1) exp(- (x/b)^a)
> 
> which is different from my density,
>
Is this homework?
It seems you need to learn (portuguese) 8th grade math: your 'a' in R is
'b'
and your 'b' in R, 'a'.
Mathematically, they are exactly the same...

Rui Barradas


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