3554 Task 3554: backache (Supervised Classification) 1 Supervised Classification 463 col_33 1 crossvalidation https://api.openml.org/api_splits/get/3554/Task_3554_splits.arff 1 10 true predictive_accuracy ARFF mythbusting_1 study_1 study_107 study_123 study_15 study_20 study_50 study_7 under100k under1m