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
Learning notes are mainly written for your own use. If you have any mistakes, please point them out
01 data type
Unlike python, variables can take names with English
score.Tony<-99 # No mistake.
Type of assignment operator
Common ones are < -, =, - >
Posted on Wed, 11 Mar 2020 08:15:43 -0400 by GimbaL
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
Addition, subtraction, multiplication and division between vectors:
> x <- 1
 1 2 3 4 5 6 7 8 9 10
 2 3 4 5 6 7 8 9 10 11
> x = 1:10
 1 2 3 4 5 6 7 8 9 10
> y = seq(1,100, length.out = 10)
 1 12 23 34 45 56 67 78 89 100
 1 2 ...
Posted on Thu, 27 Feb 2020 02:23:23 -0500 by anikin
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
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 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
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
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:
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 decision tree
--------Only for personal learning knowledge arrangement and R language / python code arrangement
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