Fitting exponential regression of form $y=ab^{x_1}c^{x_2}$

Here $x_1$ and $x_2$ are predictors and $y$ is dependent variable

how to calculate $a,b,c$ using R tool

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#### Best Answer

If the model is: log(y) ~ a + b*X1 + c*X2 with Poisson errors, …. then it would be as simple as:

`glm( y ~ X1 + X2, data = dfrm, family="poisson") `

You could get one kind of "additive" model with:

`glm( log(y) ~ X1+X2, data=dfrm, family="gaussian") `