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Improve linear model

Hello,

Attached is a Residual by Predicted Plot for some model built on historical data from some process.

When you see such a graph for residuals, what would you recommend to change in the model in order to solve the slope and make residuals be randomly distributed around 0?

Thanks in advance!

Basic Data Analysis and ModelingRe: Improve linear model

Can you share the data and model specified that resulted in the residual plot you shared? And some context on the practical problem/issue you are trying to resolve? Lacking these three things it's hard to recommend a next step that would achieve your goal.

Re: Improve linear model

Hi @LambdaCapybara4 : As @P_Bartell  indicated, it is hard to diagnose with the limited information given. That said,  my guess would be that your model is missing a predictor.

Re: Improve linear model

I retract the idea of no intercept. I also think it is a strong linear effect missing from the model.

Re: Improve linear model

Thank you for you reply

Unfortunately, the data are sensitive and cannot be shared

i will try to optimize with all the feedbacks i've got

Re: Improve linear model

Just reviewed my Fit Model dialogue window and found out "No Intercept" was checked!

Unchecking it resolved the problem, attached is the resolved Residuals Plot.

Can I ask you how did you know that from this plot? Besides tons of experience, that i guess you have...

And, if you see abnormalities in the attached improved plot, I'd also be glad to know.

Thanks a lot!

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Re: Improve linear model

@LambdaCapybara4 : Good discussion about this here.

https://stats.stackexchange.com/questions/200103/what-can-be-inferred-from-this-residual-plot

 

Re: Improve linear model

Understood about the '...sensitive...' nature of your data. Not uncommon. But did you know within the JMP ecosystem there is a pathway to anonymize data that is easy to use and works for many users? It's described here in the JMP documentation: Anonymize Data in JMP