(1) It is not acceptable to use "wanna" in written English. You should say
"I want to fit a model ....".
(2) The model you have fitted is *not* equivalent to the model you first
state.
If you write "y ~ x/(a+x)" you are tacitly implying that
y = x/(a+x) + E
where the "errors" E are i.i.d. with mean 0.
If this is the case then it will *not* be the case that
1/y = 1 + a/x + E
with the E values being i.i.d. with mean 0.
If the model "y ~ x/(a+x)" is really what you want to fit, then you should
be using non-linear methods, e.g. by applying the function nls().
cheers,
Rolf Turner
On 21/08/13 09:39, Ye Lin wrote:
Hey All,
I wanna to fit a model y~x/(a+x) to my data, here is the code I use now:
lm((1/y-1)~I(1/x)+0, data=b)
and it will return the coefficient which is value of a
however, if I use the code above, I am not able to draw a curve the
presents this equation. How can I do this?
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