Trend lines
Let's return to the bubble plot of Height versus Weight, colored by Gender, for 20 year olds. It's now time to add trends lines and compare the trend lines when we do and do NOT account for the survey weights.
This exercise is part of the course
Analyzing Survey Data in R
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Add non-survey-weighted trend lines to bubble plot
ggplot(data = NHANES20, mapping = aes(x = Height, y = Weight, size = WTMEC4YR, color = Gender)) +
geom_point(alpha = 0.1) +
guides(size = "none") +
geom____(method = ___, se = FALSE, linetype = 2)