**Daily update | 25 July, 2022**

# StackExchange

#### What are the languages produced by context free-grammars with backspace?

**Source:** cs**Views:** 117**Score:** 3**Tags:** context-free formal-grammars

#### QR interview problem Guessing order of draws from iid U(0,1)

**Source:** stats**Views:** 16**Score:** 2**Tags:** probability uniform-distribution order-statistics interview

#### logistic regression with independent variable not-normally distributed (but potentially normally distributed)

**Source:** stats**Views:** 38**Score:** 2**Tags:** distributions logistic elastic-net

#### If a regression model is predicting some monthly value, does it apply to last 30 days or to this calendar month during prediction time?

**Source:** stats**Views:** 11**Score:** 2**Tags:** regression machine-learning

#### lavaan warning: The variance-covariance matrix of the estimated parameters (vcov) does not appear to be positive definite

**Source:** stats**Views:** 11**Score:** 1**Tags:** r structural-equation-modeling confirmatory-factor lavaan