RStudio Commands/Basics: Labs 1-4 Flashcards
What is the command for square root?
sqrt (x)
What is the command for assigning a variable title to a number or operation?
variable letter/title <- # or operation
What is the command for absolute value?
Abs (x)
What is the command for rounding a number up?
Round (X, # of digits to round to)
What is the command for identifying the data type of the variable?
typeof (x)
What is the command for confirming the data type of the variable?
is.typeofdata (x)
What is the command for creating a vector?
c(x, x, x, x, x, x…)
What is the command for titling a vector?
title of vector <- c(x, x, x, x, x….)
What is the command for repeating vectors?
variable title <- rep(value, times=# to be repeated)
What is the command for a sequence of numbers?
from#:to#
What is the command for combining vectors of data to make a data frame?
data_name = data.frame(variable_1….,variable_f)
What is the command for isolating data that meets a certain condition?
subset(data_name, condition of subset)
What is the command for filtering items of the same data?
data_name%>%filter(vectortitle==”item wanted”)
What is the command for calculating the mean of a vector?
mean(data_name$vector name
What is the command for calculating a summary of the data in a vector (IQR, Q1, Median, Q3, min/max)?
summary(data_name$vector name)
What is the command for creating a histogram?
hist(data_name$vector name)
What is the command for adding a title to a histogram?
histogram command, main=”title of histogram”
What is the command for importing a csv file into R?
read.csv(“pathway/file_name”)
What is the command for installing a package?
install.packages(“name of package”)
What must be around each piece of CHARACTER data when creating a vector of it?
quotations must be around each individual piece of data in order to create a vector of it
ex. c(“yes”, “no”, “yes,”, “yes”, “no”…)
Which package must be installed in order for filtering a vector to be possible?
package “dpylr”
What are the 4 types of data in R?
- numeric (double)
- integer (L notation used to indicate integer)
- character (strings)- alphabet, number/symbols, “” must be used to indicate that the data is character data
- logical (T or F)
What is the command for creating a boxplot?
boxplot(data_name$variable, ylab= “y axis label”, main= “title of boxplot”)
What is the command for labeling individual values from a dataset?
levels(data_name$variable) <-c(“label of choice” = value of interest)
What is the command for physically printing the name of the value?
print(data_name$variable wanting to be labeled from levels command)
What is the command for creating a matrix?
matrix_name<-(data_vector, nrow=, ncol=)
What is the command for creating a 2x2 contingency table?
matrix_name<-matrix(c(vector 1, vector 2…), # of rows, # of columns)
What is the command for creating titles for the rows and columns of the contingency table?
dimnames(matrix_name)<-list (row label= c(“option1”, “option2”, column label= c(“option1”, “option2”))
What is the command for summing up rows and columns?
addmargins(matrix_name)
What is the command for creating a list (a way of storing information)?
list_name<-list(variable1=””, variable2=””, variable3= ““…)
What is the command for extracting a specific variable from the list?
list_name$variable_of_interest
What is the command for calculating proportion of the rows?
prop.table(data, margin= 1)
What is the command for calculating proportion of the columns?
prob.table(data, margin=2)
