R Programming Language Certification Data Visualization & Graphics in R

Question 1

Which R package is most widely used for creating advanced data visualizations based on the Grammar of Graphics?

Accepted Answer

ggplot2

Answer

lattice

Answer

base graphics

Answer

plotly

Question 2

In ggplot2, which function is used to add a scatter plot layer to a plot?

Accepted Answer

geom_point()

Answer

geom_scatter()

Answer

geom_dot()

Answer

geom_xy()

Question 3

What does the aes() function do in ggplot2?

Accepted Answer

Defines aesthetic mappings between data variables and visual properties

Answer

Sets color themes

Answer

Adjusts axis scales

Answer

Exports plots to files

Question 4

Which ggplot2 function is used to create separate panels for different subsets of data?

Accepted Answer

facet_wrap()

Answer

panel_split()

Answer

grid_layout()

Answer

subset_plot()

Question 5

In base R, which function saves a plot as a PNG file?

Accepted Answer

png()

Answer

save_plot()

Answer

export_png()

Answer

write_plot()

Question 6

Which ggplot2 function changes the overall visual style of a plot (background, grid lines, font)?

Accepted Answer

theme()

Answer

style()

Answer

format()

Answer

layout()