1, Is a PhD worth it in machine learning?

It’s about the puzzle of a statistics graduate who wants to have a degree in Machine learning.

2, What is the use of manifold learning?

Why we need manifold learning? What’s the biggest advantage of manifold machine learning?

3, Is the p-value a good measure of evidence?

Statistics abounds criteria for assessing quality of estimators, tests, forecasting rules, classification algorithms, but besides the likelihood principle discussions, it seems to be almost silent on what criteria should a good measure of evidence satisfy.” M. Grendár

4, What’s the relationship between Principal Component Analysis (PCA) and Ordinary Least Squares (OLS)?