Exploratory Data Analysis

Knowledge on Exploratory Data Analysis is contributed by whom?

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What is exploratory data analysis?

• A rigid framework by which we analyze data

• An initial way by which we can get a feel for data

• A type of purely quantitative method of data analysis

• A set of scientific principles for analyzing data in a categorical manner

Most often, EDA relies on _____.

• visual techniques

• assumptions

• fixed models

• testing for statistical significance

Which of the following is a principle of analytic graphics?

• Don't plot more than two variables at at time

• Only do what your tools allow you to do

• Show box plots (univariate summaries)

• Integrate multiple modes of evidence

What is the role of exploratory graphs in data analysis?

• They are typically made very quickly.

• They are made for formal presentations.

• Only a few are constructed.

• xes, legends, and other details are clean and exactly detailed.

Which of the following is true about the base plotting system?

• The system is most useful for conditioning plots.

• Plots are created and annotated with separate functions.

• Plots are typically created with a single function call.

• Margins and spacings are adjusted automatically depending on the type of plot and the data.

Which of the following is an example of a valid graphics device in R?

• The computer screen

• A Microsoft Word document

• A file folder

• A png file

Bitmapped file formats can be most useful for

• Plots that require animation or interactivity

• Scatterplots with many many points

• Plots that may need to be resized

• Plots that are not scaled to a specific resolution

Which of the following functions is typically used to add elements to a plot in the base graphics system?

• hist()

• plot()

• text()

• boxplot()

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 PNG device with png(), then copy it to a PDF with dev.copy2pdf().

• Construct the plot on the screen device and then copy it to a PDF file with dev.copy2pdf()

• Open the screen device with quartz(), construct the plot, and then close the device with dev.off().

• Open the PostScript device with postscript(), construct the plot, then close the device with dev.off().