How to fit a quadratic (curved) line through a scatter plot?. Help

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#1

Year Price HAS decades
1 1982 40000 8.98 1980-1989
2 1984 50000 34.30 1980-1989
3 1984 45000 11.00 1980-1989
4 1987 1400000 243.00 1980-1989
5 1989 100000 9.40 1980-1989
6 1989 8000000 69.90 1980-1989

cbrf %>% ggplot(aes(x = HAS, y = PRICE)) +

  • geom_jitter() +

  • scale_y_log10(labels = scales::dollar_format()) +

  • facet_wrap(~ decades, scales = "free_x") +

  • geom_smooth(method = "lm", color = "grey", se = FALSE) +

  • theme_light()
#2

add a formula to geom_smooth, using x and y rather than HAS and PRICE:

geom_smooth(method = "lm", formula = y ~ x + I(x^2), color = "grey", se = FALSE)

or

geom_smooth(method = "lm", formula = y ~ poly(x, 2), color = "grey", se = FALSE)
#3

Thank you so much! Have a nice day.

#4

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