How can I set priors in Classification Learner with QDA

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I am using Classifiaction Learner App to try out various classifiaction techniques. When I run QDA, I would like to set the priors to the default of 1/K (K groups) before I train. I do not see a way to do that.

Answers (1)

Shanmukha Voggu
Shanmukha Voggu on 28 Dec 2021
Hi Eugene,
According to my knowledge, In Classification Learner App, it is not possible to set the number of groups in QDA(Quadratic Discriminant Analysis)
For greater flexibility, train a discriminant analysis model using fitcdiscr
As a workaround, QDA can be done using fitdiscr function along with KFold Name-Value Pair to randomly partition the data into k sets.
Refer to this for more information.
  1 Comment
Eugene Davis
Eugene Davis on 28 Dec 2021
Thanks for the feedback. I have only two groups and that is fixed and compatible with Classification Learner. I want to set the prior probabilities for thoise groups. Now it may still be true that I need to call fitdisc. I would hope that custom priors can be added to the App.

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