Fitting linear log regression with fitlm function

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Spirit
Spirit 2017 年 11 月 6 日
コメント済み: Star Strider 2017 年 11 月 7 日
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!

回答 (1 件)

Star Strider
Star Strider 2017 年 11 月 6 日
編集済み: Star Strider 2017 年 11 月 6 日
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.)
  2 件のコメント
Spirit
Spirit 2017 年 11 月 7 日
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
Star Strider
Star Strider 2017 年 11 月 7 日
I’m lost.
Good luck!

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