Fitting linear log regression with fitlm function

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Spirit 2017-11-6

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https://ww2.mathworks.cn/matlabcentral/answers/365390-fitting-linear-log-regression-with-fitlm-function

评论： Star Strider 2017-11-7

I would like to fit y = log(x) + k using fitlm (linear regression). How can I specify such a model? This is linear regression so would like to use fitlm function and not the fitnlm. Thanks!

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Answer 1

Star Strider 2017-11-6

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https://ww2.mathworks.cn/matlabcentral/answers/365390-fitting-linear-log-regression-with-fitlm-function#answer_289694

编辑：Star Strider 2017-11-6

在 MATLAB Online 中打开

Try this:

mdl = fitlm(log(x), y);

It assumes a linear model (slope and intercept), so this is all that is necessary.

NOTE — This will work providing that ‘x’ is real and positive. (I mention that for clarity.)

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Spirit 2017-11-7

Thanks StarStrider. I could do this way but this prevents me from using standard fitlm postprocessing functions say plot(mdl) for example. It plots a linear function as the actual regression is happening on log(x) vs. y.

I'd like to get a regression fit to y ~ log(x) + y using fitlm. I'd this should be possible as this still falls under the realm of linear regression.

Best, Shriram