**Daily update | 27 September, 2022**

# StackExchange

#### Is there any intuitive meaning to $\beta^T A \beta=1$?

**Source:** stats**Views:** 61**Score:** 5**Tags:** quadratic-form

#### Logistic regression: What are use cases for logistic regressions where $n \neq 1$, i.e., $n >1$?

**Source:** stats**Views:** 54**Score:** 3**Tags:** machine-learning logistic mathematical-statistics generalized-linear-model binomial-distribution

#### Alternatives to scatterplot for visualisation for large samples

**Source:** stats**Views:** 72**Score:** 3**Tags:** data-visualization scatterplot

#### Stacking: Use predictions of train or test to create features for level 1 classifier

**Source:** datascience**Views:** 74**Score:** 2**Tags:** machine-learning classification data-leakage stacking

#### How to *formalize mathematically* that a binary classifier has no predictive performance?

**Source:** stats**Views:** 77**Score:** 2**Tags:** machine-learning classification optimization supervised-learning metric