See also the following links:

▎ENGLISH

A Practical Introduction to K-Nearest Neighbors Algorithm for Regression (with Python code)
▸ https://www.analyticsvidhya.com/blog/2018/08/k-nearest-neighbor-introduction-regression-python/

Regression: K-nearest neighbors
▸ https://datasciencebook.ca/regression1.html

▎日 本 語

k-最近傍法 – 回帰
▸ http://taustation.com/knn-regression-basic/

k最近傍法(k-Nearest Neighbor, k-NN)でクラス分類・回帰分析・モデルの適用範囲(適用領域)の設定をしよう！
▸ https://datachemeng.com/knn/