**Daily update | 13 March, 2022**

# StackExchange

#### I'm confused by the notation in this question

**Source:** stats**Views:** 26**Score:** 1**Tags:** r mathematical-statistics

#### Possible pitfalls/accuracy issues using a weighted average of a median

**Source:** stats**Views:** 13**Score:** 1**Tags:** median weighted

#### Categorical variable with too many categories. Should I group them according to frequency or according to the target?

**Source:** stats**Views:** 13**Score:** 1**Tags:** multiple-regression categorical-data categorical-encoding many-categories

#### Statistical power of tests on unequal and known variances vs equal but unknown variances

**Source:** stats**Views:** 24**Score:** 1**Tags:** hypothesis-testing inference descriptive-statistics statistical-power

#### Show that the estimator $ \delta_n(X)=\Phi(\sqrt{\frac{n}{n-1}}(a-\bar{X}_n)) $ is an unbiased estimator

**Source:** stats**Views:** 26**Score:** 1**Tags:** self-study mathematical-statistics