Nothing
firstDigit <- function(x) {
trunc(x / 10^(floor(log10(abs(x)))))
}
# rivers contains lengths (mi) of 141 major North American rivers
# Rivers has first digits of lengths in miles and km
Rivers <-
tibble(
digit = 1:9,
model = log10(digit + 1) - log10(digit),
miles = as.numeric(tally( ~ firstDigit(rivers), format = "prop")),
km = as.numeric(tally( ~ firstDigit(1.61 * rivers), format = "prop"))
) %>%
tidyr::gather(source, proportion, model:km)
gf_point(proportion ~ digit, color = ~ source, data = Rivers) %>%
gf_line(proportion ~ digit, color = ~ source, data = Rivers) %>%
gf_refine(scale_x_continuous(breaks = 1:10))
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