4 | R: Graphics

Question 1

(POLL)

To create a bitmap graphics we can use the command (could be in exam!):
- pdf
- png
- save.image
- none-of-them

Answer 1

png

(save.image: does not create a picture but rather a workspace image!! )

Question 2

(POLL)

To plot the distribution of a categorical variable
* assocplot
* barplot
* boxplot
* piechart
* xyplot

Answer 2

barplot, piechart

(assocplot is for two vars)

Question 3

(POLL)

To visualize the distribution of a numerical variables we use the command:
* assocplot
* barplot
* hist
* pie

Answer 3

hist

Question 4

(POLL)

To create a multifigure plot I can use the function …. (select two):
* figure
* layout
* mfcol
* mfrow
* par

(exam not so tricky questions)

Answer 4

layout, par

(mfcol and mfrow are arguments for par)

Question 5

6
To display a mathematical function we use the ______ command.

Answer 5

curve()

Question 6

To visualize the distribution of a numerical value we use the ______ function.

Answer 6

hist()

Question 7

To visualize the distribution of a factor variable we use the ______ function together with the ______ function.

Answer 7

table(), barplot()

Question 8

To compare two groups with regards to a numerical variable we use a ______ .

Answer 8

boxplot()

Question 9

To visualise the Pearson residuals of a contingency table we use the ______ function or focus on the proportions in this table we use a ______ .

Answer 9

assocplot(), mosaicplot()

Question 10

To display the relationship between two numerical variables we use a ______ .

Answer 10

(xy)plot()

Question 11

7
Which of the below are low level commands that can be used to annotate an existing plot?

Answer 11

• points
• text
• axis
• hist
• boxplot
  points (box), text, axis

Question 12

8
To arrange plots which should take different sizes but should be shown together we use the _____ function with a _____ of integers.

Answer 12

layout(), matrix

Question 13

To arrange plots with a regular layout of the same size we can use the _____ command together with the _____ option for instance

Answer 13

par(), mfrow