Exam 2 (R Studio)
How can you create a .R file?
- Click "File|New File|R Script" in the menu
How can you open an existing .R file?
- click "File|Open File" to browse for the .R file
How can you save a .R file?
- click "File|Save"
What is a Vector?
A sequence of data elements of the same basic type. Ex: scores= (65,75,80,82,92)
What do we use to pick specific elements in a vector?
Brackets [] aka indexing vectors Ex: > scores[1] [1] 65 > scores[2:3] [1] 75 80 > scores[c(1,4)] [1] 65 88
What can we use to get specific information out of a vector?
Brackets [}aka Indexing Vectors Ex: > scores[1] [1] 65 > scores[2:3] [1] 75 80 > scores[c(1,4)] [1] 65 88
How can you install a package on R?
By typing install.packages("XXX")
When it comes to vector what will length give you?
How many elements are in a set?
How is the Working Directory useful in reference to R?
It helps keep everything in a self contained directory,helps organize code and analyses
What is R script?
R script is where you keep a record of your work in R and R Studio
When it comes to vector what will max give you?
The highest number in the set
When it comes to vector what will mean give you?
The mean of the data set
When it comes to vector what will median give you?
The median number of the data set
When it comes to vector what will summary give you?
The min, 1st quarterly, median, mean 3 quarterly, and max numbers
When it comes to vector what will min give you?
The smallest number in the set
When it comes to vector what will sd give you?
The standard deviation of the data set
When it comes to vector what will var give you?
The variance of the data set
What is a Working Directory in reference to R?
The working directory is where Rstudio will look first for scripts and files
Can R give descriptive statistics?
Yes, you can get descriptive statistics from a vector
Can vectors also have character values?
Yes. Ex: names<-c("Nikita","Dexter","Sherlock")
How can you check your current working directory when it comes to R?
getwd()
What are packages when it come to R
packages are add-on collections of R functions and code in a well-defined format
