**Daily update | 18 April, 2023**

# StackExchange

#### How should I visualize errors that can be on either size of mean

**Source:** stats**Views:** 18**Score:** 2**Tags:** data-visualization error

#### Mike Sipser and Wikipedia seem to disagree on Chomsky's normal form

**Source:** cs**Views:** 896**Score:** 2**Tags:** formal-languages computability context-free formal-grammars pushdown-automata

#### Time series statistical model evaluation: weighted average across different forecast horizons

**Source:** stats**Views:** 22**Score:** 2**Tags:** machine-learning time-series arima model-evaluation

#### Conflicting Chi Squared and Cramers V result

**Source:** stats**Views:** 15**Score:** 2**Tags:** hypothesis-testing statistical-significance categorical-data chi-squared-test cramers-v

#### Is it better to select variables before regression or performing regression and then performing tests to select the variables?

**Source:** stats**Views:** 14**Score:** 2**Tags:** regression statistical-significance multiple-regression t-test likelihood-ratio