why is knn model based why is knn not model based what is model centered regression why is knn model based why is knn model based why is it called model-based why is knn not model based why is knn model based which assumption would be considered model based in regression why is knn not model based why is linear regression model based what is knn's assumption why is knn model based why is knn not model based why is knn model based why is knn model based? which is the model for knn why is knn model based what assumptions do you make for knn why is knn model-based