statistical rethinking

1.1.1.1. Description of the centralized trend (central tendency)The main statistical indicators that describe the trend are arithmetic averages, geometric averages, median numbers, which are also known as positional metrics (measures of location) 1.1.1.1.1. Arithmetic averages (arithmetic mean)The arithmetic mean is applicable to the frequency distribution symmetrical data. In the case of outliers, or when the frequency distribution is asymmetric, it

regularization cost function:If it will be set to a maximum value (for example, for our problem, set)? So-The algorithm will still work normally and will be set up very large without affecting the algorithm itself;-The algorithm will fail on the problem of removing overfitting;-The structure of the algorithm will be less than fit (underfitting), even if the training data is very good will fail;-Gradient descent algorithm does not necessarily converge;In this case, except that the other paramete

plot summary:[Machine Xiao Wei] in the [engineer Ah Wei] accompanied by the [nine turn elixir] of the five-turn of the cultivation.This is a [statistical case] study.Drama Start:Star Calendar April 26, 2016 16:34:30, the Milky Way Galaxy Earles the Chinese Empire Jiangnan Line province.[Engineer Ah Wei] is working with [machine Xiao Wei] to study [statistical cases].b = c = D = Ksquare = (a+b+c+d)

[Home]DownloadCRANR Project About R Contributors What ' s New? Mailing Lists Bug Tracking Conferences Search R Foundation Foundation Board Members Donors Donate Documentation Manuals FAQs The R Journal Books Certification Other Links Bioconductor Related Projects The R Project for statistical computinggetting StartedR is a free softw

Statistical puzzles Statistical puzzles Time limit:4000/2000 MS (java/others) Memory limit:131070/65535 K (java/others)Total submission (s): 22667 Accepted Submission (s): 9545Problem DescriptionIgnatius recently encountered a problem, the teacher gave him a lot of words (only lowercase letters, no duplicate words appear), now the teacher asked him to count the number of words prefixed by a st

How do you count the totals when you have a large amount of data? For example, there are 5 million data in a table, the traditional way is count (), which is inefficient. Some people on the internet say that using MySQL triggers, the results are inserted into a result table. Is there any other way? such as asynchronous execution of the way to insert into a MySQL results table can it? Or is it possible to put the statistics into Redis? There is also the timing of the implementation, but w

This article mainly introduces thinkphp range query, statistical query, and SQL direct query. it analyzes the common query techniques of ThinkPHP in details in the form of examples, which is very useful, for more information about the thinkphp interval query, statistical query, and SQL direct query, see the examples in this article. Share it with you for your reference. The specific method is as follows: I

Subject table (subject ID, name, serial number, total score, excellent line, passing line, low line, comprehensive subject, subdiscipline List)Student table (student ID, school, grade, class, student ID, name) Exam form (Exam ID, school year, semester, exam name)Candidate table (examinee ID, Exam ID, school, grade, class, student ID, name)Exam subject (exam subject ID, Exam ID, subject ID, serial number, total score, excellent line, passing line, low score, comprehensive subject, subdiscipline

Website statistical analysis System Piwik (like Google Analytics), useful? I configured the Piwik,php+mysql+apache on my own server (the company). But I found that I only in my deployment of Piwik server to visit the target site, there will be statistical data, such as in other computers to visit the target site, there is no data into the Piwik, do not know how. The firewall is also off Ah, is it a question

Website statistical analysis System Piwik (like Google Analytics), useful? I configured the Piwik,php+mysql+apache on my own server (the company). But I found that I only in my deployment of Piwik server to visit the target site, there will be statistical data, such as in other computers to visit the target site, there is no data into the Piwik, do not know how. The firewall is also off Ah, is it a question

The results of the Opnet show two types: the display of vector results and the display of scalar results1. Display of vector resultsVector output is the most commonly used form of results, in most cases, the horizontal axis represents the time, this component will be monotonically increasing in the simulation, the expression is the value of the statistic changes over time.Vector Output Logical Structure2. Display of scalar resultsUnlike the vector output, only the list of individual values is re

The Wireshark is an open-source grab tool with an interface that can be used to perform statistical analysis of system traffic.InstallationSince Wireshark is interface-based, it is generally run in an interface environment and can be installed by Yum:Yum Install -y Wireshark wireshark-gnomeSo there are two packages installed here.UsageRecommended article: Wireshark Basic Introduction and learning TCP three-time handshakeLinux under the interface envir

7 Module Development-statistical analysisNote: Each statistic index can be cross-multiplied with each dimension table, so that the statistical results of each dimension are limited, the code of the cross-multiplication and the comment information are described in the projectEngineering code files, in order to display at the front-end faster, each of the indicators are calculated in advance of the dimensions

statistical period of time for each user to open or refresh a page to record 1 times, open or refresh the same page multiple times the amount of views accumulated.2, UV access (unique Visitor) refers to the number of independent guest visits, a computer terminal for a visitor.UV statistics number of users who visit a site within 1 days (based on a cookie); a computer client visiting a website is a guest. Can be understood as the number of computers a

Reference to the Http://blog.sina.com.cn/s/blog_bceeae150102v11v.html#post% of the original form of the Perceptual machine learning algorithm, algorithm 2.1 reference Hangyuan Li the second chapter in the book "Statistical Learning Method" P29Close allClear AllClcx=[3,3;4,3;1,1]; y=[1,1,-1];% training data sets and tagslearnrate=1;% Learning RateOmega=zeros (1,size (x,2))Initial value of b=0%%ω and Bi=1;k=0;While 1If Y (i) * (SUM (omega.*x (i,:)) +b)

Work, use JavaScript to make a statistical chart: When you are done, make a note, share and learn from each other. There are still some problems, not very perfect. A reference to the Baidu Space, central management Center, Access statistics, the JS statistical chart. But the application is still different, because I do this project, need to actually draw a new statistic