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October 26th, 2008, 08:00 PM   #1
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nonlinear relationship

How to actually distinguish exponential and power functions from linear functions? The answer may seem very obvious, but I have encountered one problem that asks me to transform the variable. When I graphed the two variables before transformation, the graph was linear, so why the question asked me to transform? I was confused because if the graph is linear, is that supposed to be linear function instead of exponential or power?
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October 26th, 2008, 08:01 PM   #2
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Re: nonlinear relationship

Power: y ~ x^a
Linear: y ~ x^1

So a linear relationship is a special case of a power relationship (but not an exponential relationship).
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