**Daily update | 27 April, 2022**

# StackExchange

#### How is the denominator in one sample Z test of proportion derived?

**Source:** stats**Views:** 116**Score:** 4**Tags:** hypothesis-testing

#### Why is ignoring prediction error not a concern in instrumental variables?

**Source:** stats**Views:** 22**Score:** 2**Tags:** bayesian instrumental-variables measurement-error 2sls

#### Using a z-test for proportion in place of Chi-Square

**Source:** stats**Views:** 31**Score:** 2**Tags:** chi-squared-test z-test

#### Does the fraction of explained variance in the first PCA component necessarily drop if you remove features from the dataset?

**Source:** stats**Views:** 24**Score:** 2**Tags:** pca

#### Solving $T(n) = 2T(\lfloor{\frac{n}{2}}\rfloor) + n$ with substitution method

**Source:** cs**Views:** 29**Score:** 2**Tags:** recurrence-relation