I was running a sPLS-DA model and when I tried to use that to predict based on test dataset, some of the predictions were empty. The predicted values were just like this.
The way I built the model could work on some other similar datasets in my project. I have checked this test dataset, and there is no missing data at all. Is this normal? Anyone have experienced similar errors before or can give me a hint on possible reasons for this?
Thanks so much for your help.