[R] Simple question regarding to specifying model

[BvZ]

I have hunted around but cannot find the command which allows me to specify
parameters of a model.

For example,

model.m1 <- nls(y ~ alpha * x1/(beta + x1), data = data, start = list(beta =
20, alpha = 120), trace = TRUE)

This will estimate the parameters, which allows to investigate the
residuals.

What I would like to do is fix the parameters to the data that I have
estimated elsewhere, to analyse their residuals. For example,

model.m2 <- y ~ 80 * x1/30 +x1 ??????

Thanks


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