Dear Dmitry,
Take a look at ?nls and its examples.

HTH,

Jorge


On Tue, May 12, 2009 at 5:44 PM, Dmitry Gospodaryov
<gospodaryov@rambler.ru>wrote:

> I have the data:
> for x: 2, 8, 14, 20, 26, 32, 38, 44, 50, 56, 62, 68, 74,
> for y: 100, 99, 99, 98, 97, 94, 82, 66, 48, 38, 22, 10, 1.
> y depends on x by equation: y = 100*exp(b*(1-exp(c*x))/c),
> where b and c are coefficients. I need to find coefficients in this
> equation for given data. How can I do that by means of R?
> Thank you for advance. With regard, Dmitry.
>
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