The MP-443 Grach [a] (Russian: MП-443 Грач, lit. 'rook') or "PYa", for " Pistolet Yarygina " ("Yarygin Pistol"), following traditional Russian naming procedure ( Russian : Пистолет Ярыгина ), is currently the Russian standard military-issue side arm .

ARCH模型（Autoregressive conditional heteroskedasticity model）全称“自回归条件异方差模型”，解决了传统的计量经济学对时间序列变量的第二个假设（方差恒定）所引起的问题。GARCH模型称为广义ARCH模型，是ARCH模型的拓展，由Bollerslev(1986)发展起来的。

作者：yiqi.feng 原文链接： 金融时间序列入门（四）--- ARCH、GARCH前言前面几篇介绍了ARMA、ARIMA及季节模型，这些模型一般都假设干扰项的方差为常数，然而很多情况下时间序列的波动有集聚性等特征，使得方差并…

2021年12月19日 · 文章浏览阅读2.2w次，点赞43次，收藏286次。时间序列分析之garch模型介绍与应用前言一：arch模型的相关性质二：arch实验过程三：garch模型的轮廓介绍四：garch实验过程五：总结前言在arima模型中，我们一般假设干扰项的方差为常数，然而在很多情况下，时序波动的干扰项方差并不为常数。

The MP-443 ‘Grach’ or ‘Yarygin’ pistol has been the standard sidearm of all branches of Russian military and law enforcement since 2003.

Grach may refer to: MP-443 Grach, a Russian pistol. Sukhoi Su-25, a turbojet powered armored ground support aircraft. Foel Grach, a mountain in the Welsh Carneddau. Rafayel Grach, a former Soviet speed skater and Olympic medalist. Chaim Soloveitchik, Rabbi part of the Brisker dynasty. Grach, an Elvish curse word in the Tolkien universe

2022年6月20日 · Page details technical specifications, development, and operational history of the MP-443 (Grach) Semi-Automatic Military Service Pistol including pictures.

The MP-443 Grach (Russian: MP-443 Грач[1]) is Russian standard military-issue side arm. It was developed under designation "Grach" in response to Russian military trials, which began in 1993. In 2003, it was adopted under designation PYa[2] (GRAU index 6P35) as a …

The Sukhoi Su-25 Grach (Russian: Грач ; NATO reporting name: Frogfoot) is a subsonic, single-seat, twin-engine jet aircraft developed in the Soviet Union by Sukhoi. It was designed to provide close air support for Soviet Ground Forces. The first …

The MP-443 Grach (Russian: MP-443 «Грач»; English: MP-443 Rook; GRAU designation: 6P35), also known as the PYa (ПЯ, Пистолет Ярыгина, Pistolet Yarygina; Yarygin Pistol), is a Russian pistol designed for Russian 9x19mm 7N21 and 7N31 overpressure rounds.