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  3. Analyzing Survey Data in R

Exercise

Line of best fit

What's the relationship between height and weight across all ages?

In this exercise, we will add the line of best fit to a bubble plot and see that the trend isn't very linear. We can create a polynomial curve by adding the argument formula = y ~ poly(x, d) to geom_smooth() where d is the degree of the polynomial. For example, d of 2 adds a quadratic and a d of 3 adds a cubic.

Instructions 1/2

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  • Create a bubble plot of Height (as x) and Weight (as y) in NHANESraw. Add a line of best fit using geom_smooth() with method = "lm" and mapping WTMEC4YR to weight.