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MGG exam 8 – Q’s and A’s
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MGG exam 8 – Q’s and A’s
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MGG exam 8 – Q’s and A’sWhat is the first input necessary? - - library(ggplot2)
- How do you set your basic plot to a variable (P)? - - p <- ggplot(dataset,
aes(x,y))
- What must you add to get a graph? - - a geom statement -
p+geom_point()
- How do you add color to your ggplot? - - p+geom_point(aes(color=cyl))
- What is the difference between p+geom_point(aes(color=cyl)) and
p+geom_point(aes(color=factor(cyl)))? - - without the factor, the values are
regarded as continuous numerics
- How do you make data points different shapes? - -
p+geom_point(aes(shape=factor(cyl)))
- Is "cyl" a discrete or continuous variable? - - discrete
- What happens when you try to assign shape to continuous variables? - -
an error message will appear
- Is "qsec" a discrete or continuous variable? - - continuous
- What is a good way to show continuous numerical data? - - by changing
size
- What is difficult with a large dataset? - - the points become so crowded
that it is difficult to distinguish
- What can you do to make a large dataset easier to read? - - change alpha
(transparency)
- How do you change alpha? - - d+geom_point(alpha=1/100)
- What is the difference between "color" and "fill" - - color indicates
perimeter of the point and fill indicates interior of the point
- How do you add labels to the x and y axis? - - by writing +labs(x = "title of
x axis" , y = "title of y axis")
- How do you scale the plot? - - scale_x_continuous(limits = c(3,4))
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