RapidMiner

Linear regression, removing the constant term from the model

Regular Contributor

Linear regression, removing the constant term from the model

Hi guys,
I'm trying to run a linear regression model with dummy variables and I need to get rid of the constant term in my model but I do not see how to do this. It seems it can not be done through the Rapidminer's GUI (I am using learner\supervised\functions\linearregression operator).
Please help me.

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4 REPLIES
RMStaff

Re: Linear regression, removing the constant term from the model

Hello,

I am afraid this is currently not possible. I must admit that I never had a problem where this would have made any sense though  Smiley Wink

Cheers,
Ingo

How to load processes in XML from the forum into RapidMiner: Read this!
Regular Contributor

Re: Linear regression, removing the constant term from the model

Just offering my opinion...

If I understand the question correctly, he's essentially looking for the equivalent to the "Constant is Zero" option in Excel's Regression functionality in the Data Analysis add-in.

I haven't had to do it with RapidMiner yet, but I certainly have had circumstances where I wanted to model something with no constant. i.e. Structurally, I knew that if all the input variables were zero, the dependent variable would also have to be zero, and I wanted the regression to reflect that behavior, while otherwise using regression to find the best constants for the input variables.  So I could definitely see myself using such an option again in the future.


RMStaff

Re: Linear regression, removing the constant term from the model

Hi again,

ok, if there are already two people out there who would like this, we have reached a critical mass  Smiley Wink

Just kidding: Thanks for pointing this out again. II just have realized an example where this indeed could be very useful. So we have added a new parameter to the linear regression learner called "use_bias" which can be turned off. You can obtain the new version via CVS (described here: http://rapid-i.com/content/view/25/48/ ; please use the branch "Zaniah" for the latest developer version). Of course, this new feature will also be part of the next Enterprise Edition update.

Cheers,
Ingo

How to load processes in XML from the forum into RapidMiner: Read this!
Regular Contributor

Re: Linear regression, removing the constant term from the model

Wow...thanks a lot guys Smiley Surprised