# Copyright 2014 Tesora Inc.# All Rights Reserved.## Licensed under the Apache License, Version 2.0 (the "License"); you may# not use this file except in compliance with the License. You may obtain# a copy of the License at## http://www.apache.o…
1.Alpha Level (Significance Level,显著水平): What is it? 显著性水平α是指当零假设是正确的,但做出了错误决策的概率(即一类错误的概率).Alpha水平(有时称为“显著性水平”)用于假设测试.通常,这些测试的alpha值为0.05(5%),但是其他常用的值是0.01和0.10. The significance level α is the probability of making the wrong decision when the null…
Node.js 操作Mongodb1.简介官网英文文档 https://docs.mongodb.com/manual/ 这里几乎什么都有了MongoDB is open-source document database that provides high performance , high availability , and automatic scaling.MongoDB是一个开源的文档数据库,提供高性能.高可用性.自动缩放2.安装详细的安装相关信息,比如支持哪些系统,32位和6…
db的帮助文档 输入:db.help(); db.AddUser(username,password[, readOnly=false]) 添加用户 db.auth(usrename,password) 设置数据库连接验证 db.cloneDataBase(fromhost) 从目标服务器克隆一个数据库 db.commandHelp(name) returns the help for the command db.copyDatabase(fromdb,t…