**Daily update | 10 March, 2022**

# StackExchange

#### Low-rank matrix completion is NP-hard

**Source:** cs**Views:** 21**Score:** 3**Tags:** optimization reductions np-hard matrices sparse-matrices

#### Is Kernel-Regression parametric or non-parametric?

**Source:** stats**Views:** 26**Score:** 2**Tags:** regression mathematical-statistics nonparametric kernel-smoothing parametric

#### Closed form for a markov chain, where transition probabilities depend on $n$?

**Source:** stats**Views:** 41**Score:** 2**Tags:** probability markov-process

#### Sorted degrees and maximal degree in dynamic graphs

**Source:** cs**Views:** 25**Score:** 2**Tags:** algorithms graphs online-algorithms streaming-algorithm dynamic-graphs

#### OLS is BLUE (or BUE) to minimize MSE. Is quantile regression is BLUE to minimize MAE?

**Source:** stats**Views:** 26**Score:** 1**Tags:** least-squares quantile-regression gauss-markov-theorem