underfitting overfitting k-means 머신러닝 machine learning classification 분류 Negatively Skewed Positively Skewed Standard Z Scaling Min-Max Scaling 집락추출 단순임의추출 Silhouette coefficient method Elbow method Non-hierachical clustering Gini Reduction Data split 과다적합 피처엔지니어링 K Nearest Neighbors 특성공학 불순도 계통추출 Hold-out Impurity 층화추출 나이브베이즈 사후확률 cross validation 경사하강법 confusion matrix 과소적합 과대적합 Cost function 군집추출 Missing Value feature engineering 지도학습 로지스틱 회귀분석 언더피팅 오버피팅 manhattan distance euclidean distance 비계층적 군집분석 다중공선성 결측치 선형회귀분석 Unsupervised learning 강화학습 Naive Bayes 의사결정나무 비지도학습 accuracy Preprocessing supervised learning Reinforcement Learning AUC neighbors iQR RMSE gradient descent logistic regression OUTLIER 군집분석 mse 전처리 클러스터링 unpivot Precision RIDGE LASSO Recall clustering ROC entropy decision tree sampling KNN 기계학습 조인 샘플링 pivot JOIN Normalization F1