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PCA : the basics - explained super simple

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PCA : the math - step-by-step with a simple example

Factor Analysis and Principal Component Analysis Using SPSS | A User-Friendly Guide

Principal components analysis in R

Covariance and the correlation matrix - with simple examples

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Principal Component Analysis (PCA) - easy and practical explanation

Factor Analysis (Principal Components Analysis) with Varimax Rotation in SPSS

Partial least squares regression (PLSR) - explained

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Principal Component Analysis and Factor Analysis in Stata

K nearest neighbors (KNN) - explained | validation

Principal component regression (PCR) - explained

Principal Component Analysis on SPSS

Data Analysis 6: Principal Component Analysis (PCA) - Computerphile