[R] writing equations

[Antonio Olinto]

Dear R-list members,

I have a data frame with two columns (X, Y). How can I write the following
equation (using nls)

log(X2/X1) ~ a + b * (Y1+Y2)/2 + c * (X1+X2)/2

To calculate the fitted values for each line (Xi) I have to use numbers in
consecutive lines (Xi, Xi+1, Yi and Yi+1).

Thanks,

Antonio Olinto



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