R Functions

Question 1

!

Answer 1

NOT

Question 2

c()

Answer 2

Combine

Question 3

length()

Answer 3

Tells length

Question 4

head()

Answer 4

first six lines

Question 5

tail()

Answer 5

last few lines

Question 6

names()

Answer 6

returns column names

Question 7

rownames()

Answer 7

returns row names

Question 8

colnames()

Answer 8

returns column

Question 9

dim()

Answer 9

returns dimensions

Question 10

sort()

Answer 10

sorts vector in ascending or descending order

Question 11

nrow()

Answer 11

counts the number of rows

Question 12

%in%

Answer 12

which A are in B (gives TRUE or FALSE)

Question 13

-

Answer 13

excludes variable

Question 14

unique()

Answer 14

gives unique values

Question 15

str()

Answer 15

gives the structure

Question 16

system()

Answer 16

run basic commands

Question 17

summary()

Answer 17

returns summary

Question 18

rep()

Answer 18

replicate of values

Question 19

~

Answer 19

“as a function of”

Question 20

seq()

Answer 20

sequence

Question 21

installed.packages()

Answer 21

already installed paackages

Question 22

install.packages

Answer 22

install packages in ‘’

Question 23

sum()

Answer 23

adds

Question 24

sqrt()

Answer 24

square root

Question 25

%%

Answer 25

remainder

Question 26

mean()

Answer 26

mean

Question 27

min()

Answer 27

minimum

Question 28

max()

Answer 28

maximum

Question 29

median()

Answer 29

median

Question 30

var()

Answer 30

variance

Question 31

sd()

Answer 31

standard deviation

Question 32

quantile()

Answer 32

sample quantiles based on probabilities

Question 33

prod()

Answer 33

returns product

Question 34

round()

Answer 34

rounds numbers based on decimal point

Question 35

setwd()

Answer 35

sets working directory

Question 36

getwd()

Answer 36

outputs working directory

Question 37

list.files()

Answer 37

finds files based on path

Question 38

set.seed()

Answer 38

number to initiate the pseudorandom number generator

Question 39

sample()

Answer 39

sample from a vector

Question 40

for(xinY){}

Answer 40

for loop to cycle through commands

Question 41

if(x==TRUE){}

Answer 41

if (x) is TRUE then do whatever is inside brackets

Question 42

else{}

Answer 42

if whatever inside if statement is FALSE then do …

Question 43

dev.new()

Answer 43

opens a new window

Question 44

dev.off()

Answer 44

shuts off connection to file

Question 45

plot()

Answer 45

plots your data

Question 46

points()

Answer 46

adds points to plot

Question 47

legend()

Answer 47

adds a legend

Question 48

par()

Answer 48

changes parameters

Question 49

pdf()

Answer 49

creates a pdf of Plot

Question 50

stripchart()

Answer 50

gives stripchart of raw data

Question 51

hist()

Answer 51

histogram

Question 52

boxplot()

Answer 52

boxplot

Question 53

mtext()

Answer 53

adds text to margins

Question 54

abline()

Answer 54

y=mx+b

Question 55

layout()

Answer 55

sets up a figure canvas up to 4 panels