P值与significant的理解 来源:广州市统计局   发表日期:2015-01-21     P值可以理解为结论的风险大小,也就是根据数据得出的结果有多大的错误风险,P值越小,结论错误的风险越小,即结论越可靠.P值越大,错误的风险越大,即结论的可靠性差.实际上significant的含义应该是“非偶然的”,当根据样本资料所得结果是significant,实际上表明这一结果“不是偶然”得到的,更可能是真实存在这样一种结果.关于P值的理解         P值可以理解为结论的风险大小,也就是根

A/B testing主要用来检测网站或者APP的两个版本中哪一个更好,它的中心思想是把流量一分为二,一份用作experiment group,访问新的版本,另一份用作control group,访问旧的版本. 假设现在有一个网站,要测试是否增大网页Register的字体,可以增加注册用户. 进行AB testing,首先要选择Unit of Diversion, 就是把实验分成两组的标准.在这个实验中,可以选择unique cookies to view the web page. 然后要选定

Cloud computing can broadly be broken down into three main categories based on the deployment model. Here is a definition of each one, courtesy of Wikipedia: Public Cloud Public cloud applications, storage, and other resources are made available to t

更多来自:   www.vipcoursea.com   Ethics 部分 Objective of codes and standard:永远是为了maintain public trust in 1.Financial market  2.Investment profession 6个code of ethics 1.Code 1—ethics and pertinent d persons a. 2.Code 2---primacy of client’s interest a.Int

P<0.05就够了?还要校正!校正!3个方法献上 (2017-01-03 17:55:12) 转载▼   分类: 数理统计 (转  医生科研助手 解螺旋 微信公众号)   当有多组数据要比较时,不管是ANOVA,还是非参的Kruskal-Wallis检验等等,都只能看出整体的几组之间有没有差异.要是有,那么差异在哪里呢?还要做个两两比较才知道.OK,两两比较又要怎么做?有的小伙伴自然而然地会想到,每两组之间做一个T检验不就好了.To naive!这是个吃力不讨好的活,用这样的方式打开T检验会增加

Multiple Regression What is multiple regression? Multiple regression is regression analysis with more than one independent variable. It is used to quantify the influence of two or more independent variables on a dependent variable. The general multip

目录 AIMR Suggested Fixed-Income Readings I. Perspectives on Interest Rates and Pricing of Traditional Fixed-Income Securities, Yield Curve Behavior, and Monetary Policy 1 Overview: Institutional Details and Pricing Fundamentals 2 Yield Curve Analysis-

显著性,又称统计显著性(Statistical significance), 是指零假设为真的情况下拒绝零假设所要承担的风险水平,又叫概率水平,或者显著水平. [1] 显著性的含义是指两个群体的态度之间的任何差异是由于系统因素而不是偶然因素的影响.我们假定控制了可能影响两个群体之间差异的所有其他因素,因此,余下的解释就是我们所推断的因素,而这个因素不能够100%保证,所以有一定的概率值,叫显著性水平(Significant level). 总的来说,它表示群体之间得以相互区别的能力.在统计假设检

t检验中的t值和p值是什么关系_t检验和p值的关系 t检验中通过样本均值 总体均值 样本标准差 样本量 可以计算出一个t值,这个t值和p值有什么关系? 根据界值表又会查出一个数,这个数和t值比较,得出大小,判断是否接受原假设.感觉p值一直都没有什么作用? 解答:在进行t检验时,会计算出一个t值,而在选定显著性水平后,可以找到相比较的t值,两者可以比较,判断显著性.p值代表的是不接受原假设的最小的显著性水平,可以与选定的显著性水平直接比较.例如取5%的显著性水平,如果p值大于5%,就接受原假设,否

9.5 Hypothesis Tests for One Population Mean When σ Is Known 使用z-test前提(同使用mean distribution之前的考虑) 在H0假设的同时需要说明significant level Statistical Significance Versus Practical Significance:综合考虑使用sample 得到的mean和H0的mean,就实际意义来看,如果差不多则可以约等. The Relation betw

9.2 Critical-Value Approach to Hypothesis Testing example: 对于mean 值 275 的假设: 有一个关于sample mean的distribution: 已知population 标准差和sample size=25的情况下: 标准型Z为: 其中,significant level=5%,已知的mean 即为Ho假设中的值且population 标准差已经提供 存在这样的mean distribution: 通过term 解释得到:

查看ADDM(数据库版本为ORACLE 10.2.0.5.0)报告时,发现其中有个结论非常不靠谱:Significant virtual memory paging was detected on the host operating system,具体内容如下所示: FINDING 2: 100% impact (3930 seconds) ------------------------------------- Significant virtual memory paging was d

Monitoring the Battery Level and Charging State PreviousNext This lesson teaches you to Determine the Current Charging State Monitor Changes in Charging State Determine the Current Battery Level Monitor Significant Changes in Battery Level You should

9.1 The Nature of Hypothesis Testing Over the years, however, null hypothesis has come to mean simply a hypothesis to be tested. Null Hypothesis: H0: μ = μ0, where μ0 is some number Alternative Hypothesis: two tailed 实例: one tailed 实例: 评判标准: Type I a

从别的地方导入一个项目的时候,经常会遇到eclipse/Myeclipse报Description  Resource Path Location Type Java compiler level does not match the version of the installed Java project facet.出现这个问题的原因是因为,eclipse/myeclipse的jdk编译版本与出现问题的项目JDK编译版本不一致所导致! 1.先设置好jdk,需要确定 项目,eclipse/m

今天在导入工程进Eclipse的时候竟然出错了,控制台输出的是: [2013-02-04 22:17:13 - takepicture] Android requires compiler compliance level 5.0 or 6.0. Found '1.4' instead. Please use Android Tools > Fix Project Properties. 解决办法: 1. 项目 右键 ->android tools ->Fix Project 2. 如果

http://developer.android.com/guide/topics/manifest/uses-sdk-element.html Platform Version       API Level               VERSION_CODE                       Android 6.0 23 M     Android 5.1 22 LOLLIPOP_MR1     Android 5.0 21 LOLLIPOP     Android 4.4W 2

Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root). For example:Given binary tree {3,9,20,#,#,15,7}, 3 / \ 9 20 / \ 15 7 return its bottom-up level order tr

Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right to left for the next level and alternate between). For example:Given binary tree {3,9,20,#,#,15,7}, 3 / \ 9 20 / \ 15 7 return its

Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level). For example:Given binary tree {3,9,20,#,#,15,7}, 3 / \ 9 20 / \ 15 7 return its level order traversal as: [ [3], [9,20], [15,7] ] 层序

Platform Version API Level VERSION_CODE Notes Android 4.4 19 KITKAT Platform Highlights Android 4.3 18 JELLY_BEAN_MR2 Platform Highlights Android 4.2, 4.2.2 17 JELLY_BEAN_MR1 Platform Highlights Android 4.1, 4.1.1 16 JELLY_BEAN Platform Highlights An