Displaying 2 results from an estimated 2 matches for "dogy".
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2006 Sep 28
1
Nonlinear fitting - reparametrization help
...for this problem ?
I have appended some R code with sample data to fit.
Thank you !!!
Suresh; please cc ssk2031 at columbia.edu if possible.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
x=seq(-10,10,length=1000)
a0=0;
ae=1;
me=0;
se=1;
ai=0.5;
mi=0;
si=3;
dogy <- function(x,a0,ae,me,se,ai,mi,si){
y=a0+ae*exp(-0.5*(((x-me)/se)^2))-ai*exp(-0.5*(((x-mi)/si)^2))
y}
y=dogy(x,a0,ae,me,se,ai,mi,si)
erval=rnorm(length(y),sd=0.02)
y=y+erval
#plot(x,y+erval)
#fit=nls(y~ae*exp((x/se)^2)-ai*exp((x/si)^2),start=c(ae=.8,se=1.1,ai=.2,si=1),trace=TRUE)
#here I t...
2011 Jan 26
1
Making up a graph and its equation which better fits two groups of data
Dear R-folks:
I have a group of data ('x' and 'y' axis), but I'd like to know how to draw a graph which would fits my data in a better way, I also need its equation. Could you give me any R-rutine ideas?.
I thank you in advance for your kind support.
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