Video: Lines, curves and smoothers [4 min]
In this video, we discuss putting trends onto scatterplots using software.
(See also the Review Questions following the movie)
After you’ve watched this video, you should be able to answer these questions:
- What shapes can be captured by each of linear, quadratic and cubic trend curves?
- What advantage does a smoother have over quadratic or cubic curves?
- Why shouldn’t we take the behaviour of flexible trend curves at the right and left-hand edges of the plot too seriously?
- If you ask iNZight, or most standard software, to put a curve of a particular type onto the scatterplot (e.g. a quadratic), how does it choose which curve of this type to draw?
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