Boscovich data used to estimate the ellipticity of the earth. There are five measurements of the arc length of one degree of latitude taken at 5 different latitudes. See Koenker (2005) for further details and references.
A data frame containing 5 observations on 3 variables
sine squared of latitude measured in degrees
arc length of one degree of latitude measured in toise - 56,700, one toise approximately equals 1.95 meters.
References
Koenker, R. (2005), "Quantile Regression", Cambridge.
Use the following R code to directly access this dataset in R.