R help - Jan 2005 - Non linear Square fit Function

Hi all,
I'm trying to use the nls function to do a nls curve fit. I have a histogram
for my data. I need to get athe best curve fit for this. i am plotting
experimental vs the theoretical values. my experimental values are got from my
dnorm function, mean=mean of my mid values(hist) and sd=sd of my mid values. For
the theoretical i'm using mean and sd of all 20000 raw values as the start
values. I'm getting no sd in my new curve. Can someone gimme some pointers
to get started here.
I need my nls to spit out sd and mean of the new fit which it does'nt. is
there a better function or can i somehow get around this.
Thanks in advance.
 
Choudary Jagarlamudi
Instructor
Southwestern Oklahoma State University
STF 254
100 campus Drive
Weatherford OK 73096
Tel 580-774-7136

	[[alternative HTML version deleted]]

Have you tried fitdistr in the MASS package (should be installed with R by
default)?

Andy
> From: Jagarlamudi, Choudary
> 
> Hi all,
> I'm trying to use the nls function to do a nls curve fit. I 
> have a histogram for my data. I need to get athe best curve 
> fit for this. i am plotting experimental vs the theoretical 
> values. my experimental values are got from my dnorm 
> function, mean=mean of my mid values(hist) and sd=sd of my 
> mid values. For the theoretical i'm using mean and sd of all 
> 20000 raw values as the start values. I'm getting no sd in my 
> new curve. Can someone gimme some pointers to get started here.
> I need my nls to spit out sd and mean of the new fit which it 
> does'nt. is there a better function or can i somehow get around this.
> Thanks in advance.
>  
> Choudary Jagarlamudi
> Instructor
> Southwestern Oklahoma State University
> STF 254
> 100 campus Drive
> Weatherford OK 73096
> Tel 580-774-7136
> 
> 	[[alternative HTML version deleted]]
> 
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