5

Question 1

List in R?

Answer 1

A vector like thing where the elements can be anything in the same list.

list()

Question 2

Sublist in R?

Answer 2

x[c(x, b)]

Question 3

Extracting value from a list?

Answer 3

x$name_of_element or x[[1]] where first square brackets get the name of element place and the second extract the value of it.

Question 4

Dataframe in R?

Answer 4

data.frame(vector1, vector2, vector3, vector4, vector5, stringsAsFactors = FALSE), since we don’t want our strings to be turned into factors, where the vectors get turned into columns.

Question 5

What do the rows of a data frame mean?

Answer 5

The characteristics

Question 6

Combine the rows/characteristics of two the same data frames to one?

Answer 6

rbind(dataframe1, dataframe2)

Question 7

How to add a new vectors/columns to a dataframe?

Answer 7

cbind(dataframe, vector)

Question 8

Extract column from dataframe?

Answer 8

dataframe$column_name, dataframe[rows,columns]

Question 9

Scatterplot?

Answer 9

plot(x, y, xlab = “x label”, ylab = “y label”, main = “title”)

Question 10

qqplot?

Answer 10

qqplot(x, y)

Question 11

Mosaic plot?

Answer 11

mosaicplot(~y+z, data = dataframe, xlab, ylab, main, col=c())

Question 12

Boxplot?

Answer 12

boxplot(dataframe$column, horizontal = TRUE/FALSE, )

Question 13

Comparing box plots?

Answer 13

boxplot(numerical_vector/column1~categorical_vector/column2, data = dataframe)

Question 14

Barplot?

Answer 14

barplot(table(vector)) so it can give you the counts/frequencies of each categorical variable.

Question 15

Which must be equal lengths of the two vectors: scatter plot or qqplot?

Answer 15

Scatter plot

Question 16

x grouped by y?

Answer 16

x~y