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1 uiz Feedback Coursera 1 of 7 01/06/ :02 Feedback Week 2 Quiz Help You submitted this quiz on Sat 17 May :19 AM CEST. You got a score of out of Question 1 Under the lattice graphics system, what do the primary plotting functions like xyplot() and bwplot() return? nothing; only a plot is made an object of class "plot" an object of class "lattice" an object of class "trellis" Total / Question 2 What is produced by the following code? A set of 3 panels showing the relationship between weight and time for each diet. A set of 3 panels showing the relationship between weight and time for each rat. A set of 11 panels showing the relationship between weight and diet for each time.
2 2 of 7 01/06/ :02 A set of 16 panels showing the relationship between weight and time for each rat. Total / Question 3 Annotation of plots in any plotting system involves adding points, lines, or text to the plot, in addition to customizing axis labels or adding titles. Different plotting systems have different sets of functions for annotating plots in this way. Which of the following functions can be used to annotate the panels in a multi-panel lattice plot? points() text() llines() lines() Total / Question 4 The following code does NOT result in a plot appearing on the screen device. Which of the following is an explanation for why no plot appears? The xyplot() function, by default, sends plots to the PDF device. There is a syntax error in the call to xyplot().
3 uiz Feedback Coursera of 7 01/06/ :02 The object 'p' has not yet been printed with the appropriate print method. The variables being plotted are not found in that dataset. Total / Question 5 In the lattice system, which of the following functions can be used to finely control the appearance of all lattice plots? par() print.trellis() splom() trellis.par.set() Total / Question 6 What is ggplot2 an implementation of? the Grammar of Graphics developed by Leland Wilkinson a 3D visualization system the S language originally developed by Bell Labs the base plotting system in R Total /
4 4 of 7 01/06/ :02 Question 7 Load the `airquality' dataset form the datasets package in R. I am interested in examining how the relationship between ozone and wind speed varies across each month. What would be the appropriate code to visualize that using ggplot2? qplot(wind, Ozone, data = airquality, geom = "smooth") airquality = transform(airquality, Month = factor(month)) qplot(wind, Ozone, data = airquality, facets =. ~ Month) qplot(wind, Ozone, data = airquality) qplot(wind, Ozone, data = airquality, facets =. ~ factor(month)) Total / Question 8 What is a geom in the ggplot2 system? a statistical transformation a method for mapping data to attributes like color and size a plotting object like point, line, or other shape a method for making conditioning plots Total /
5 5 of 7 01/06/ :02 Question 9 When I run the following code I get an error: I was expecting a scatterplot of 'votes' and 'rating' to appear. What's the problem? The object 'g' does not have a print method. The dataset is too large and hence cannot be plotted to the screen. There is a syntax error in the call to ggplot. ggplot does not yet know what type of layer to add to the plot. Total / Question 10 The following code creates a scatterplot of 'votes' and 'rating' from the movies dataset in the ggplot2 package. After loading the ggplot2 package with the library() function, I can run How can I modify the the code above to add a loess smoother to the scatterplot? qplot(votes, rating, data = movies, smooth = "loess") qplot(votes, rating, data = movies) + stats_smooth("loess") qplot(votes, rating, data = movies) + geom_smooth() qplot(votes, rating, data = movies, panel = panel.loess)
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