ZhangZhihuiAAA - 博客园

Machine Learning - Principal Component Analysis (PCA) Part II

摘要： import matplotlib.pyplot as plt import numpy as np import pandas as pd import random as rd from sklearn import preprocessing from sklearn.decompositio 阅读全文

posted @ 2025-07-16 10:50 ZhangZhihuiAAA 阅读(6) 评论(0) 推荐(0)

Machine Learning - Principal Component Analysis (PCA) Part I

摘要： SVD understand the variables vectors rather than scalers Step-by-step process to calculate eigenvalues in PCA ✅ Step 1: Standardize the data Before ap 阅读全文

posted @ 2025-07-13 22:01 ZhangZhihuiAAA 阅读(15) 评论(0) 推荐(0)

Machine Learning - Regularization: Elastic-Net Regression

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posted @ 2025-07-13 18:27 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0)

Machine Learning - Regularization: LASSO Regression

摘要： LASSO regression (short for Least Absolute Shrinkage and Selection Operator) is a type of linear regression that performs both regularization and feat 阅读全文

posted @ 2025-07-13 15:50 ZhangZhihuiAAA 阅读(18) 评论(0) 推荐(0)

Machine Learning - Regularization: Ridge Regression

摘要： Ridge Regression is a type of linear regression that includes a regularization term to prevent overfitting. It’s particularly useful when dealing with 阅读全文

posted @ 2025-07-13 07:33 ZhangZhihuiAAA 阅读(17) 评论(0) 推荐(0)

Statistics - Chi-square Test

摘要： The Chi-square test (also written as χ² test) is a statistical hypothesis test used to determine whether there is a significant association between tw 阅读全文

posted @ 2025-07-12 18:05 ZhangZhihuiAAA 阅读(12) 评论(0) 推荐(0)

Machine Learning - Odds Ratio and Log(Odds Ratio)

摘要： Chi-square Test 阅读全文

posted @ 2025-07-12 17:30 ZhangZhihuiAAA 阅读(3) 评论(0) 推荐(0)

Statistics - Fisher's Exact Test

摘要： Fisher's Exact Test is a statistical significance test used to determine whether there is a nonrandom association between two categorical variables, t 阅读全文

posted @ 2025-07-12 11:41 ZhangZhihuiAAA 阅读(19) 评论(0) 推荐(0)

Machine Learning - Odds and Log(Odds)

摘要： (50, 50), (40, 60), (70, 30), (20, 80), (90, 10),, ......, log them, draw a histogram 阅读全文

posted @ 2025-07-12 09:04 ZhangZhihuiAAA 阅读(8) 评论(0) 推荐(0)

Machine Learning - Design Matrices for Linear Models

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posted @ 2025-07-11 18:23 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0)

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