RStudio Commands/Basics: Labs 1-4

Question 1

What is the command for square root?

Answer 1

sqrt (x)

Question 2

What is the command for assigning a variable title to a number or operation?

Answer 2

variable letter/title <- # or operation

Question 3

What is the command for absolute value?

Answer 3

Abs (x)

Question 4

What is the command for rounding a number up?

Answer 4

Round (X, # of digits to round to)

Question 5

What is the command for identifying the data type of the variable?

Answer 5

typeof (x)

Question 6

What is the command for confirming the data type of the variable?

Answer 6

is.typeofdata (x)

Question 7

What is the command for creating a vector?

Answer 7

c(x, x, x, x, x, x…)

Question 8

What is the command for titling a vector?

Answer 8

title of vector <- c(x, x, x, x, x….)

Question 9

What is the command for repeating vectors?

Answer 9

variable title <- rep(value, times=# to be repeated)

Question 10

What is the command for a sequence of numbers?

Answer 10

from#:to#

Question 11

What is the command for combining vectors of data to make a data frame?

Answer 11

data_name = data.frame(variable_1….,variable_f)

Question 12

What is the command for isolating data that meets a certain condition?

Answer 12

subset(data_name, condition of subset)

Question 13

What is the command for filtering items of the same data?

Answer 13

data_name%>%filter(vectortitle==”item wanted”)

Question 14

What is the command for calculating the mean of a vector?

Answer 14

mean(data_name$vector name

Question 15

What is the command for calculating a summary of the data in a vector (IQR, Q1, Median, Q3, min/max)?

Answer 15

summary(data_name$vector name)

Question 16

What is the command for creating a histogram?

Answer 16

hist(data_name$vector name)

Question 17

What is the command for adding a title to a histogram?

Answer 17

histogram command, main=”title of histogram”

Question 18

What is the command for importing a csv file into R?

Answer 18

read.csv(“pathway/file_name”)

Question 19

What is the command for installing a package?

Answer 19

install.packages(“name of package”)

Question 20

What must be around each piece of CHARACTER data when creating a vector of it?

Answer 20

quotations must be around each individual piece of data in order to create a vector of it
ex. c(“yes”, “no”, “yes,”, “yes”, “no”…)

Question 21

Which package must be installed in order for filtering a vector to be possible?

Answer 21

package “dpylr”

Question 22

What are the 4 types of data in R?

Answer 22

• 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)

Question 23

What is the command for creating a boxplot?

Answer 23

boxplot(data_name$variable, ylab= “y axis label”, main= “title of boxplot”)

Question 23

What is the command for labeling individual values from a dataset?

Answer 23

levels(data_name$variable) <-c(“label of choice” = value of interest)

Question 24

What is the command for physically printing the name of the value?

Answer 24

print(data_name$variable wanting to be labeled from levels command)

Question 25

What is the command for creating a matrix?

Answer 25

matrix_name<-(data_vector, nrow=, ncol=)

Question 26

What is the command for creating a 2x2 contingency table?

Answer 26

matrix_name<-matrix(c(vector 1, vector 2…), # of rows, # of columns)

Question 27

What is the command for creating titles for the rows and columns of the contingency table?

Answer 27

dimnames(matrix_name)<-list (row label= c(“option1”, “option2”, column label= c(“option1”, “option2”))

Question 28

What is the command for summing up rows and columns?

Answer 28

addmargins(matrix_name)

Question 29

What is the command for creating a list (a way of storing information)?

Answer 29

list_name<-list(variable1=””, variable2=””, variable3= ““…)

Question 30

What is the command for extracting a specific variable from the list?

Answer 30

list_name$variable_of_interest

Question 31

What is the command for calculating proportion of the rows?

Answer 31

prop.table(data, margin= 1)

Question 32

What is the command for calculating proportion of the columns?

Answer 32

prob.table(data, margin=2)