**Daily update | 01 March, 2022**

# StackExchange

#### Why Spearman's rank correlation ranges from from -1 to 1

**Source:** stats**Views:** 291**Score:** 6**Tags:** mathematical-statistics correlation spearman-rho ranks

#### Law of Total Variance

**Source:** stats**Views:** 29**Score:** 3**Tags:** r probability variance poisson-distribution gamma-distribution

#### How do you generalise that the probability of "head" occurring on a coin is 0.5?

**Source:** stats**Views:** 459**Score:** 3**Tags:** probability

#### Applying PCA to each group of features separately to use it in a predictive model

**Source:** stats**Views:** 71**Score:** 3**Tags:** machine-learning pca predictive-models feature-selection

#### If a data set appears to be normal after some scaling is applied, is it really normal?

**Source:** stats**Views:** 29**Score:** 3**Tags:** normality-assumption multidimensional-scaling