The Earthquake data frame has 182 rows and 5 columns.
This data frame contains the following columns:
an ordered factor with levels
20 < 16 < 14 < 10 < 3 <
8 < 23 < 22 < 6 < 13 <
7 < 21 < 18 < 15 < 4 <
12 < 19 < 5 < 9 < 1 <
2 < 17 < 11 indicating the earthquake
on which the measurements were made.
a numeric vector giving the intensity of the earthquake on the Richter scale.
the distance from the seismological measuring station to the epicenter of the earthquake (km).
a factor with levels 0 and 1
giving the soil condition at the measuring station, either
soil or rock.
maximum horizontal acceleration observed (g).
Measurements recorded at available seismometer locations for 23 large earthquakes in western North America between 1940 and 1980. They were originally given in Joyner and Boore (1981); are mentioned in Brillinger (1987); and are analyzed in Davidian and Giltinan (1995).