Tag：Statistics

Get the interviewer – can you tell me how you usually use COUNT() in MySQL?
Hello everyone, I am a programmer. I believe that in your work, there are many functions that need to use count(*) to count the number of data rows in the table. At the same time, for some large data tables, using count is trembling, and it is often processed in combination with cache. So, let's […]

Introduction to data analysis learning guide, zero basic white can easily understand
Data analysis is becoming more and more important in today’s job market. However, what puzzles many friends is that I am Xiaobai without programming foundation. Can I learn data analysis? How to learn data analysis? In fact, if you plan to become a data analyst, it doesn’t matter how you came from. Data science is […]

Sharing 10 new skills for sorting, grouping and statistics with SQL
1. use sorting to order dataUsually, all you really need is to arrange all your data in a certain order. The order by statement of SQL can organize data in alphabetical or numerical order. Therefore, similar values are sorted together by group. However, the sorting result of this grouping is not a real grouping. Order […]

Understanding RNA SEQ from a statistical perspective
This is to share an overview of Li Jingyi’s team《Modeling and analysis of RNAseq data: a review from a statistical perspective》To understand the analysis of RNA SEQ from the perspective of Statistics Direction of analysis Currently, there are four main directions for RNA SEQ data(of course, in fact, there are more than these. You can […]

Five methods and skills of Python counting times
catalogue 1、 Use dictionary dict statistics 2、 Using collections Defaultdict statistics 3、 List count method 4、 Use set and list statistics 5、 Collections Counter method 1、 Use dictionary dict statistics Loop through the element of an iteratable object. If there is no such element in the dictionary, the element will be used as the key […]

JS script for counting web page online time
Check whether it is online every xxxxx milliseconds,TR_ After count times, the setting changes the user to the suspended state (i.e. not active on the current page, AFK..)Send the dwell time when the page is closed, /**//* ————————————————————————— * Script Name: online.js * Last Modified: 2008413 22:25 * Author: meyu * Copyright (c) 2008 *Purpose: track online time* —————————————————————————*/ function TR_XMLHttpObject(url)…{ this.XMLHttp=null; this.url=url; this.init=function()…{ if(window.XMLHttpRequest)…{ this.XMLHttp=new XMLHttpRequest(); }else if(window.ActiveXObject)…{ this.XMLHttp=new ActiveXObject(“Microsoft.XMLHTTP”); } }; […]

Simple implementation of browsing statistics function of PHP Ajax website page 1 / 2
It is implemented in PHP language. If you can’t understand it, please leave a message I believe the principle is the sameWhy use PHP as an example language?There are no more than two factors: 1 If you have a little basic PHP grammar, you can understand it easily; 2. Less codeThe directory structure of the […]

[introduction to icomics] part I: Interpretation of official definitions. What’s the matter? Reading this channel is enough!
“How can I analyze after feature extraction?” “I want to find out the characteristics with statistical differences. What statistical method should I use?” “What is the connotation of lasso? Is it really so powerful?” “What is rad score? How to calculate it?” “That horizontal line one by one, with scores…. yes, it’s fall lonely gram! […]

Svn based code submission statistics tool implemented by shell script
Nothing happened recently. I wrote a code statistics gadget based on SVN with bash. You can specify the directory of statistics. The default is recursive statistics subdirectory. At present, there is no function to mask the specified directory. Ha, the code is rough. But sun it out first. #!/bin/bash – #”””””””””””””””””””””””””””””””””””””””””””””””””””””””””””””””””””””””””””” # FILE: lines.sh # […]

Learning list of station B data analysis course!
Article source – official account – Data kaleidoscope B station data analysis course learning list! Click the blue word above to follow us After more than a year of transportation, Xiaobian B station has accumulated many quality data analysis courses, official account, and small buddy. The course includes data thinking series, basic statistics series, interview […]

Two methods of specifying the number of strings in Linux statistics file
Counting the number of a string in a file is actually like looking for a stone in a piece of sand. Some people see the stone, make a mark (grep) on it, and then remember how many marks they have made; Some people see a stone, jump it (awk), and then count how many times […]

Yii framework combined with charjs statistics of the previous year and the current year data method example
This paper describes the Yii framework combined with charjs statistical data of the previous year and the current year. The details are as follows: Theoretically, there are 12 months in a year, but in fact, last year’s 12 months have passed, which is a complete 12 months. This year’s 12 months have not passed, which […]