The data give the estimates of the mean number of decayed, missing and filled teeth (DMFT) at age 12 years, and the mean annual sugar consumption in the previous five years for 90 countries.
data(Dental)A data frame with 90 rows (one per person) and 4 columns:
the country; a factor
whether the country is considered an industrialized country;
a factor with levels Yes (industrialized) or
No (not industrialized)
the mean annual sugar consumption in kilograms per person per year, computed over the five years (or as much as available) prior to the survey; a numeric vector
estimates of the mean number of decayed, missing and filled teeth at age 12; a numeric vector
M. Woodward (2004) Epidemiology: Study Design and Data Analysis, second edition. Chapman and Hall.