[Math Review] Statistics Basics: A/B Testing

Inferential Statistics Generalizing from a sample to a population that involves determining how far sample statistics are likely to vary from each other and from the population parameter. Sampling Distribution The sampling distribution of a statistic

Two Types of Estimation One of the major applications of statistics is estimating population parameters from sample statistics. There are types of estimation: Point Estimate: the value of sample statistics Point estimates of average height with multi

Matrix and Determinant Let C be an M × N matrix with real-valued entries, i.e. C={cij}mxn Determinant is a value that can be computed from the elements of a square matrix. The determinant of a matrix A is denoted det(A), det A, or |A|. In the case of

Marble testing is an expressive way to test observables by utilizing marble diagrams. This lesson will walk you through the syntax and features, preparing you to start writing marble tests today! Grep two files from the rxjs https://github.com/Reacti

20 Best Code Review Tools for Developers Apr 02, 2015by vikas in TOOLS A programmer always faces the pressure of deadlines and with many delays the software which is designed is quite unstable and the whole product is unstable. The cause of this inst

1. Gerrit Gerrit is a web based code review system, facilitating online code reviews for projects using the Git version control system. Gerrit makes reviews easier by showing changes in a side-by-side display, and allowing inline comments to be added

1.Normal distribution In probability theory, the normal (or Gaussian or Gauss or Laplace–Gauss) distribution is a very common continuous probability distribution. Normal distributions are important in statistics and are often used in the natural and

前言 本节我们来综合比较NOT IN VS NOT EXISTS VS LEFT JOIN...IS NULL的性能,简短的内容,深入的理解,Always to review the basics. NOT IN.NOT EXISTS.LEFT JOIN...IS NULL性能分析 我们首先创建测试表 USE TSQL2012 GO CREATE SCHEMA [compare] CREATE TABLE [compare].t_left ( id INT NOT NULL PRIMARY KE

前言 本节我们来分析LEFT JOIN和NOT EXISTS,简短的内容,深入的理解,Always to review the basics. LEFT JOIN...IS NULL和NOT EXISTS分析 之前我们已经分析过IN查询在处理空值时是基于三值逻辑,只要子查询中存在空值此时则没有任何数据返回,而LEFT JOIN和NOT EXISTS无论子查询中有无空值上处理都是一样的,当然比较重要的是利用LEFT JOIN...IS NULL来检查NULL.基于二者返回的结果集是一样的,下面我们