I write because I have a question concerning to prediction function. I have a PLSDA model defined by 5 chemical variables and I would predict the class of new samples. However, these samples have available only 4 chemical variables. I run the function with theses samples, and even if they have not all the variables they were classified (with a missing variable).
Do you know how the function can classify unknown samples with a missing variable? how it is possible?
Thanks very much!!!