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meh's user avatar
meh's user avatar
meh
  • Member for 10 years, 3 months
  • Last seen more than 4 years ago
  • USA
22 votes

Why does basic hypothesis testing focus on the mean and not on the median?

16 votes
Accepted

Regression without intercept: deriving $\hat{\beta}_1$ in least squares (no matrices)

15 votes
Accepted

Introduction to machine learning for mathematicians

12 votes

What does PAC learning theory mean?

12 votes

Is it true that the percentile bootstrap should never be used?

11 votes
Accepted

Interaction between a predictor and its quadratic form?

8 votes

how does XGBoost do regression using trees?

8 votes

When AIC and Adjusted $R^2$ lead to different conclusions

6 votes

What is an intuitive explanation for how PCA turns from a geometric problem (with distances) to a linear algebra problem (with eigenvectors)?

5 votes

Is there a mathematical expression that shows how LASSO shrinks coefficients (including some to zero)?

5 votes

Is there a name for the phenomenon of false positives counterintuitively outstripping true positives

4 votes

Why does linear regression use a cost function based on the vertical distance between the hypothesis and the input data point?

4 votes
Accepted

Formal equation for variance retention in PCA

4 votes

Is a decision stump a linear model?

4 votes
Accepted

Linear Regression: Conditional Independence of dependent variable

4 votes

What are the implications of the curse of dimensionality for ordinary least squares linear regression?

3 votes

Clarification in information geometry

3 votes

Is it possible to train a neural network without backpropagation?

3 votes

Does the image format (png, jpg, gif) affect how an image recognition neural net is trained?

3 votes
Accepted

Is there a way to reconstitute the unit of measurement in PCA?

3 votes

Why is least squares performing as well as ridge regression when there is multicollinearity?

3 votes

Lasso centering and standarization with R

3 votes

Does 10 heads in a row increase the chance of the next toss being a tail?

3 votes

Why don't we want to choose a big $\lambda$ in ridge regression?

3 votes

Lasso, what happens if we dont standardize data and multiply one column with 10

3 votes

Famous easy to understand examples of a confounding variable invalidating a study

2 votes

Is mean absolute deviation smaller than standard deviation for $n\ge 3$?

2 votes

What algorithms require one-hot encoding?

2 votes

Why would this simple metric be wrong as a classifier's measure quality?

1 vote

What is the difference between PCA and PAF method in factor analysis?