Using fitlm for multiple linear model: Does this function automatically standardise the variables?

2 次查看（过去 30 天）
Tania
Tania 2014-7-14
评论： Shashank Prasanna 2014-7-15
Hi!
I just read about standardisation and that it is recommended to standardise variables in a multiple linear model. My question is now whether fitlm has done this automatically or if i need to do it?
Thank you for your help!

请先登录，再回答此问题。

采纳的回答

Shashank Prasanna
Shashank Prasanna 2014-7-14
No fitlm doesn't not standardize your data. You will have to do this prior to calling fitlm:
http://www.mathworks.com/help/stats/zscore.html
  2 个评论
Tania
Tania 2014-7-15
Great thank you. I am not quite sure if I need to standardise in my case. Do you have any experience when it is recommended to standardise and when one should not standardise? Thank you!
Shashank Prasanna
Shashank Prasanna 2014-7-15
It depends on your problem. You can standardize variables if their ranges are not comparable. As an example if x1 (0,1) and x2 (1e5,1e12). Your interpretation of the linear regression coefficients will be different if you standardize since you are transforming your data.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Analysis of Variance and Covariance 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by