An R tutorial by D. M. Wiig
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Category Archives: R Code Development
R For Beginners: Basic R Code for Common Statistical Procedures Part I
An R tutorial by D. M. Wiig
This section gives examples of code to perform some of the most common elementary statistical procedures. All code segments assume that the package ‘car’ has been loaded and the file ‘Freedman’ has been loaded as the active dataset. Use the menu from the R console to load the ’car’ dataset or use the following command line to access the CRAN site list and packages:
install.packages()
Once the ’car’ package has been downloaded and installed use the following command to make it the active library.
require(car)
Load the ‘Freedman’ data file from the dataset ‘car’
data(Freedman, package="car")
List basic descriptives of the variables:
summary(Freedman)
Perform a correlation between two variables using Pearson, Kendall or Spearman’s correlation:
cor(filename[,c("var1","var2")], use="complete.obs", method="pearson")
cor(filename[,c("var1","var2")], use="complete.obs", method="spearman")
cor(filename[,c("var1","var2")], use="complete.obs", method="kendall")
Example:
cor(Freedman[,c("crime","density")], use="complete.obs", method="pearson")
cor(Freedman[,c("crime","density")], use="complete.obs", method="kendall")
cor(Freedman[,c("crime","density")], use="complete.obs", method="spearman")
In the next post I will discuss basic code to produce multiple correlations and linear regression analysis. See other tutorials on this blog for more R code examples for basic statistical analysis.
R Video Tutorial: Basic R Code to Load a Data File and Produce a Histogram
R For Beginners: Some Simple R Code to Load a Data File and Produce a Histogram
A tutorial by D. M. Wiig
I have found that a good method for learning how to write R code is to examine complete code segments written to perform specific tasks and to modify these procedures to fit your specific needs. Trying to master R code in the abstract by reading a book or manual can be informative but is more often confusing. Observing what various code segments do by observing the results allows you to learn with hands-on additions and modifications as needed for your purposes.
In this document I have included a short video tutorial that discusses loading a dataset from the R library, examining the contents of the dataset and selecting one of the variables to examine using a basic histogram. I have included an annotated code chunk of the procedures discussed in the video.
The video appears below with the code segment following.
Here is the annotated code used in the video:
###################################
#use the dataset mtcars from the ‘datasets’ package
#select the variable mpg to do a histogram
#show a frequency distribution of the scores
##########################################
#library is ‘datasets’
#########################################
library(“datasets”)
#########################################
#take a look at what is in ‘datasets’
#########################################
library(help=”datasets”)
#######################################
#take a look at the ‘mtcars’ data
#########################################
View(mtcars)
#######################################
#now do a basic histogram with the hist function
###########################################
hist(mtcars$mpg)
#############################################
#dress up the graph; not covered in the video but easy to do
############################################
hist(mtcars$mpg, col=”red”, xlab = “Miles per Gallon”, main = “Basic Histogram Using ‘mtcars’ Data”)
###################################################
R For Beginners: Installing the JGR GUI On a Linux Platform
A Tutorial by D. M. Wiig
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Watch for more tutorials discussing R statistics on a Linux platform.
R Video Tutorial For Beginners: Installing And Using the Rcommander GUI
R Video Tutorial For Beginners: Installing And Using the Rcommander GUI
A tutorial video by D. M. Wiig
In my recent series of tutorials for those interested in the R statistical programming language I have discussed both the installation and use of the R console and R Commander statistics GUI. Before viewing the tutorial make sure the R Commander package has been download into your R library via the Install Packages menu option. This procedure was discussed in the previously posted R Commander tutorial.
Relative to this first tutorial I have have created a video that covers the initial installation of R Commander. The video is seen below:
Click the icon in the lower right side of the screen to view the tutorial in full screen mode.
I hope that you find this useful in your pursuit of learning about R statistics.
R for Beginners: Using R Commander in an Introductory Statistics Course
R for beginners: Using R Commander in introductory statistics courses
A tutorial by D. M. Wiig
As with previous tutorials in this series this document is an embedded Word documents. To view the document full screen click on the icon in the lower right corner of the window.
R for Beginners: Using R Commander for Basic t Tests and One Way ANOVA
R for Beginners: Using R Commander for Basic t Tests and One Way ANOVA
A tutorial by D. M. Wiig
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I hope that you found this tutorial informative. Stop back by to check for new installments. I have many currently in the writing stage.
R for Beginners: Using R Commander, Graphing and Correlation
A tutorial by Douglas M. Wiig
Please note that this post is an embedded Word document. To read the document full screen click on the icon in the lower right portion of the document window.
R for Beginners: Installing and Using the R Commander GUI, Part One
A tutorial by D.M. Wiig
This tutorial is posted as an embedded Word document. To view the document full screen click on the button in the lower right corner of the window. Please note that you must be online for the full page Word document display to work.
R For Beginners: Installing and Using the R Console in a Windows Environment
An R tutorial by D. M. Wiig
This tutorial is posted as an embedded Word document. To view the document full screen click on the icon in the lower-right corner of the document window.
My next post covering installing and using the Rcommander GUI will be out in a day or two.
