Linear Regression outout problem

[user345]

Hi，

I have a problem when conducting the linear regression model. The report ouput didn't show me all the predictor variables I put in. For example, I choose one vairable that contains 3 category, but the output only show me two of them. I don't know whether it because Alteryx automately discounts values that have absolutely no significance? Could you help me with it? 

Thanks

[IraWatt]

Okay I've managed to replicate your problem. Essentially the linear regression tool in its default settings doesn't work with string/categorical variables they should all be numeric. 

Error from non numeric variables:

Only shows 2 of my 3 categories: 

What you need to do is one hot encode categorical variable before adding them to the model. This would mean having a column for each of your categories and inputting 1 for true and 0 for false if that row is that variable. 

[IraWatt]

@user345 Here is a link to a gallery tool which will automatically encode your categorical variables One-Hot Encoder - Alteryx Community