PLS Predict Negative Results

Frequently asked questions about PLS path modeling.
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Raja Rizal
PLS Junior User
Posts: 7
Joined: Tue Oct 27, 2015 3:17 pm
Real name and title: Raja Rizal Iskandar Raja Hisham, Mr.

PLS Predict Negative Results

Post by Raja Rizal » Thu Nov 15, 2018 2:39 pm

Hi PLS experts,

I run my model using PLS Predict. I have three main variables in my study. The PLS output in the LV Prediction Summary-PLS table, RMSE and MAE columns indicate positive values for all variables. As for Q2 column, two variables are of positive values while the remaining variable is negative (i.e. -0.072).

My question, is it common for having negative value in PLS Predict? How to interpret the negative value?

Thanks~

jmbecker
SmartPLS Developer
Posts: 879
Joined: Tue Mar 28, 2006 11:09 am
Real name and title: Dr. Jan-Michael Becker

Re: PLS Predict Negative Results

Post by jmbecker » Thu Nov 15, 2018 3:33 pm

A negative result for the Q² means that your model is worse in predicting the outcome than a simple mean.
Dr. Jan-Michael Becker, University of Cologne, SmartPLS Developer
Researchgate: https://www.researchgate.net/profile/Ja ... v=hdr_xprf
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