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…

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…

出现警告的过程是: 1.搭建ambari集群成功后,添加了hdfs和zk组件,然后启用了kerberos: 2.kerberos启用完毕后添加hbase和yarn.MapReduce.hive都没有出现警告 3.添加kafka之后,在ambari的kerberos处更新了票据,这时候发现hive和yarn出现了警告,前台是403错误,通过查看后台日志发现,报了这样一个警告: Failure unspecified at GSS-API level (Mechanism level: Checks…

1. logback-spring.xml 配置 <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> ... </appender> <appender name="ALL" class="ch.qos.logback.core.rolling.RollingFileAppender"> ... </…

class Solution { public: vector<vector<int>> levelOrder(TreeNode* root) { vector<vector<int>> res; if (root == NULL) { return res; } queue<TreeNode*,int>> q; q.push(make_pair(root,0)); while(!q.empty()){ TreeNode* node=q.f…

          题记:毕业一年多天天coding,好久没写paper了.在这动荡的日子里,也希望写点东西让自己静一静.恰好前段时间用python做了一点时间序列方面的东西,有一丁点心得体会想和大家分享下.在此也要特别感谢顾志耐和散沙,让我喜欢上了python. 什么是时间序列 时间序列简单的说就是各时间点上形成的数值序列,时间序列分析就是通过观察历史数据预测未来的值.在这里需要强调一点的是,时间序列分析并不是关于时间的回归,它主要是研究自身的变化规律的(这里不考虑含外生变量的时间序列). 为…

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…

Problem Link: https://oj.leetcode.com/problems/binary-tree-level-order-traversal/ Traverse the tree level by level using BFS method. # Definition for a binary tree node # class TreeNode: # def __init__(self, x): # self.val = x # self.left = None # se…