手法を比較

	正則化k近傍法	正則化ロジスティック回帰
分野	機械学習	機械学習
系統	Machine learning	Machine learning
提唱年	1967–2000s	1996–2005
提唱者	Extends Cover & Hart (1967); regularization formulations developed through kernel smoothing literature	Tibshirani, R. (lasso); Hoerl & Kennard (ridge); Zou & Hastie (elastic net)
種類	Instance-based / lazy learner with regularization	Penalized classification model
原典	Cover, T. & Hart, P. (1967). Nearest neighbor pattern classification. IEEE Transactions on Information Theory, 13(1), 21–27.	Tibshirani, R. (1996). Regression shrinkage and selection via the lasso. Journal of the Royal Statistical Society: Series B, 58(1), 267–288.
別名	regularized kNN, kernel-weighted kNN, distance-regularized nearest neighbors, kNN with regularization	penalized logistic regression, L1 logistic regression, L2 logistic regression, elastic net logistic regression
関連	4	5
概要	Regularized k-Nearest Neighbors (kNN) extends the classical nearest-neighbor algorithm by incorporating regularization mechanisms — most commonly kernel-based distance weighting or bandwidth control — that smooth predictions, reduce sensitivity to the choice of k, and lower variance. The result is a more stable and better-calibrated instance-based learner for classification and regression tasks on tabular data.	Regularized logistic regression extends standard logistic regression by adding an L1 (lasso), L2 (ridge), or elastic net penalty to the log-likelihood, shrinking coefficients toward zero and preventing overfitting. It is the default choice for binary or multinomial classification when you want interpretable, sparse, or stable coefficient estimates in high-dimensional or collinear feature spaces.