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Residual by Predicted Plot question_same data generate different plot with Fit Y by X and Fit model

Hi community,

 

My question is on Residual by Predicted Plot. The data set is with 2 factor: Design as the interest factor and Region as Randomized block and one response. I did ANOVA in Fit Y by X and save the Residual and Predicted to plot the Residual by Predicted Plot. But I found it looks very different from the plot from Fit model (row diagnostics). 

 

In Fit Y by X, design is selected as Factor, region is selected as Block, and Response is selected as response.

In Fit model, Design and Region is added to model effects and region is attributed as Random effect, and Response is selected as Y.

Hope somebody can help!

 

Kind regards,

 

Yuqian

AnalyticsDOEGraphicsRe: Residual by Predicted Plot question_same data generate different plot with Fit Y by X and Fit model

You used two very different models in these models. The first analysis accounted for the effect of only one of your factors (presumably Design). The effect of the blocking factor Region remained in the residuals from that model. These residuals exhibit greater variation. The second analysis accounted for both Design and Region, shrinking the residuals and producing a simpler pattern. You see the tighter pattern in the second residual plot.

 

Both plots are correct and valid. Their interpretation depends on the question you are asking.