Consumer behavior analysis of an online music retail platform

Source: Ustinian - kesci.com Original link: Consumer behavior analysis of CDNow website users Click on the above link A kind of Direct online operation without environment configuration 1, Project background CDNow, once an online music retail platform, was invested and acquired by potelsmann Enterta ...

Posted on Mon, 16 Mar 2020 23:48:26 -0400 by roice

R language learning notes

Learning notes are mainly written for your own use. If you have any mistakes, please point them out 01 data type Declare variables Unlike python, variables can take names with English a<-100 score.Tony<-99 # No mistake. Type of assignment operator Common ones are < -, =, - > 1+1;2+3;6 ...

Posted on Wed, 11 Mar 2020 08:15:43 -0400 by GimbaL

Introduction to R: Operations of matrices and arrays

1. Creating matrices and arrays Before beginning this tutorial, we need to be clear that matrices are special arrays because they are two-dimensional arrays that can be one-dimensional, three-dimensional, or even n-dimensional. For example, if you want to create a matrix with 20 elements, 4 rows and 5 columns, enter the following code: > x ...

Posted on Fri, 28 Feb 2020 21:01:51 -0500 by jkatcher

R language introduction: vector operation

Addition, subtraction, multiplication and division between vectors: > x <- 1 > x [1] 1 2 3 4 5 6 7 8 9 10 > x=x+1 > x [1] 2 3 4 5 6 7 8 9 10 11 > x = 1:10 > x [1] 1 2 3 4 5 6 7 8 9 10 > y = seq(1,100, length.out = 10) > y [1] 1 12 23 34 45 56 67 78 89 100 > x*y [1] 1 2 ...

Posted on Thu, 27 Feb 2020 02:23:23 -0500 by anikin

R uses quantstrat packages to obtain data on stocks, bonds, funds, gold, crude oil, indices, foreign exchange, and the global economy

The R language makes it very easy to obtain economic data from securities (stocks, bonds, funds, futures (gold, crude oil, etc.), indices, foreign exchange, and the Federal Reserve.Let me elaborate. The quantstrat package has complete financial data yahoo provides a wide range of securities data, including stocks, bonds, funds, futures, option ...

Posted on Mon, 24 Feb 2020 12:04:36 -0500 by Jamz

If the COVID-19 epidemic as a stock factor

This paper uses the WindAlpha single factor research framework of wankuang platform to explore the impact of COVID-19 epidemic on the stock market from the perspective of stock factors. IC analysis found that there was a significant negative correlation between the severity of the epidemic and the retu ...

Posted on Sat, 15 Feb 2020 03:25:17 -0500 by networkguy

Visualization of pneumonia infection types and numbers across provinces using R language based on geographic location

(Visualization of pneumonia infection types and numbers in each province) R language is faceted based on geographic location I don't know if you've seen any pictures like this: at first glance, you thought it was the periodic table of elements (Haha, chemistry is returned to the teacher).In fact, he d ...

Posted on Fri, 24 Jan 2020 22:14:53 -0500 by markduce

R language Bioconductor dependency management & KEGG enrichment analysis & path map & pathview error reporting solution

win10-R language 3.6.2-Bioconductor dependency management & & KEGG enrichment analysis & & path map & & path view error reporting solution 1, Environmental preparation Download the installation package (64 bit) (if there is no turning over the wall, select a domestic source t ...

Posted on Thu, 16 Jan 2020 02:21:10 -0500 by bran

R script reading summary Excel table data

It mainly uses xlsx and rJava package, opens Excel file, reads data of each table, and writes it to summary table. The following figure shows the original data table before processing: The following figure shows the processed data: code implementation Install & load the function implementation of the package. The installed.packages() fu ...

Posted on Mon, 02 Dec 2019 21:25:02 -0500 by ryanwood4

spark machine learning: r/python implementation of decision tree and computing node

spark machine learning decision tree --------Only for personal learning knowledge arrangement and R language / python code arrangement 1. Preface The project uses the decision tree in spark environment, and uses the functions in ml of r and python to learn python sklearn package when returning. ml is not convenient for draw ...

Posted on Tue, 12 Nov 2019 15:04:59 -0500 by InternetX