Benjamin Baumer, Daniel Kaplan, Nicholas Horton's Modern Data Science with R PDF

By Benjamin Baumer, Daniel Kaplan, Nicholas Horton

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The bottom line was that the forecasted launch temperatures (between 26 and 29 degrees Fahrenheit) were so much colder than anything that had occurred previously, any model for O-ring damage as a function of temperature would be untested. Pro Tip: When more than a handful of observations are present, data graphics are often more revealing than tables. Always consider alternative representations to improve communication. Pro Tip: Always ensure that graphical displays are clearly described with appropriate axis labels, additional text descriptions, and a caption.

In these elections, most of the money was spent against each candidate, and in particular, $251 million of the $274 million spent on President Obama’s campaign was spent against his candidacy. Similarly, most of the money spent on Mitt Romney’s campaign was against him, but the percentage of negative spending on Romney’s campaign (70%) was lower than that of Obama (92%). 2 is that in the latter we have used color to bring a third variable (type of spending) into the plot. This allows us to make a clear comparison that importantly changes the conclusions we might draw from the former plot.

Our relatively poor ability to perceive differences in color is a major factor in the relatively low opinion of heat maps that many data scientists have. Coordinate systems How are the data points organized? While any number of coordinate systems are possible, three are most common: Cartesian This is the familiar (x, y)-rectangular coordinate system with two perpendicular axes. Polar The radial analog of the Cartesian system with points identified by their radius ρ and angle θ. Geographic This is the increasingly important system in which we have locations on the curved surface of the Earth, but we are trying to represent these locations in a flat two-dimensional plane.

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