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Data and

Projects in R-

Studio

Material prepared in part by Etienne Low-Decarie, Zofia Taranu, Patrick Thompson Vaughn DiMarco

Learning Objectives

› Create an R project › Look at Data in R › Create data that is appropriate for use with R › Import data › Save and export data

Create an R project › A folder in R-Studio for all your work on one project (eg. Thesis chapter) › Helps you stay organized › R will load from and save to here

Create an R project in RStudio › In R Studio, select create project from the project menu (top right corner)

The Scripts

› What is this ?"

• A text file that contains all the commands you will use

› Once written and saved , your script file allows

you to make changes and re-run analyses with

minimal effort!

Create an R script

R Projects can have multiple scripts › Open the file: Data and Projects in R-Studio.R › this script has all of the code from this workshop › Recommendation › type code into the blank script that you created › refer to provided code only if needed › avoid copy pasting or running the code directly from our script

Why use R Projects?" › Close and reopen your R Project › In the R – Projects menu › Both our script and the one you created will open automatically › Great way to organize your various projects

› Remove all variables from memory › Prevents errors such as use of older data › Demo – add some test data to your workspace and then see how rm(list=ls()) removes it A<-”Test”

Clear R workspace

rm(list = ls() ) Type this in your R sc ript

Housekeeping

› # symbol tells R to ignore this › commenting/documenting › annotate someone’s script is good way to learn › remember what you did › tell collaborators what you did › good step towards reproducible science

Commenting

› Tells R where your scripts and data are › type “getwd()” in the console to see your working directory › RStudio automatically sets the directory to the folder containing your R project › a “/” separates folders and file › You can also set your working directory in the “session” menu

Working Directory

› You can have sub directories within your working directory to organize your data, plots, ect… › “./” – will tell R to start from the current working directory › Eg. We have a folder called “Data” in our working directory › “./Data” – will tell R that you want to access files in that folder

Sub Directories

Notice that R-Studio now provides information on the CO2 data

Importing Data

look at the whole dataframe look at the first few rows names of the columns in the dataframe structure of the dataframe attributes of the dataframe number of columns number of rows summary statistics plot of all variable combinations CO head(CO2) names(CO2) str(CO2) attributes(CO2) ncol(CO2) nrow(CO2) summary(CO2) plot(CO2)

Looking at Data