**Daily update | 22 March, 2023**

# StackExchange

#### Is post-hoc power analysis redundant too in the case of a *significant* result?

**Source:** stats**Views:** 50**Score:** 5**Tags:** hypothesis-testing statistical-power effect-size post-hoc

#### How cross validation works for feature selection (using stepwise regression)?

**Source:** stats**Views:** 24**Score:** 3**Tags:** regression cross-validation feature-selection model-selection stepwise-regression

#### Is the variance of the mean of a set of independent random variables equal to the average of their respective variances?

**Source:** stats**Views:** 41**Score:** 2**Tags:** variance mean random-variable standard-deviation

#### power analysis using r

**Source:** stats**Views:** 37**Score:** 2**Tags:** statistical-power analysis

#### Reduce dimensions of matrices with different shapes: Methods?

**Source:** stats**Views:** 26**Score:** 2**Tags:** r machine-learning feature-selection dimensionality-reduction