gs gs110 Profiling, Simulation and Data Analysis - Exploratory Data Analysis - Quiz No.1
gs gs110 R Language Quiz
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Question 1: Which of the following is a principle of analytic graphics?
Don’t plot more than two variables at at time
Make judicious use of color in your scatterplots
Show box plots (univariate summaries)
Show causality, mechanism, explanation
Question 2: What is the role of exploratory graphs in data analysis?
They are made for formal presentations
They are typically made very quickly
Axes, legends, and other details are clean and exactly detailed
They are used in place of formal modeling
Question 3: Which of the following is true about the base plotting system?
Margins and spacings are adjusted automatically depending on the type of plot and the data
Plots are typically created with a single function call
Plots are created and annotated with separate functions
The system is most useful for conditioning plots
Question 4: Which of the following is an example of a valid graphics device in R?
A socket connection
A Microsoft Word document
A PDF file
A file folder
Question 6: Bitmapped file formats can be most useful for ____________
Plots that may need to be resized
Plots that require animation or interactivity
Plots that are not scaled to a specific resolution
Scatterplots with many many points
Question 7: Which of the following functions is typically used to add elements to a plot in the base graphics system?
lines()
hist()
plot()
boxplot()
Question 8: Which function opens the screen graphics device for the Mac?
bitmap()
quartz()
pdf()
png()
Question 9: What does the ‘pch’ option to par() control?
the size of the plotting symbol in a scatterplot
the line width in the base graphics system
the orientation of the axis labels on the plot
the plotting symbol/character in the base graphics system
Question 10: If I want to save a plot to a PDF file, which of the following is a correct way of doing that?
Construct the plot on the screen device and then copy it to a PDF file with dev.copy2pdf()
Construct the plot on the PNG device with png(), then copy it to a PDF with dev.copy2pdf()
Open the PostScript device with postscript(), construct the plot, then close the device with dev.off()
Open the screen device with quartz(), construct the plot, and then close the device with dev.off()
