bigcity
data frame has 49 rows and 2 columns.
The city
data frame has 10 rows and 2 columns.
The measurements are the
population (in 1000's) of 49 U.S. cities in 1920 and 1930. The 49 cities are
a random sample taken from the 196 largest cities in 1920. The city
data
frame consists of the first 10 observations in bigcity
.
data(bigcity)
Cochran, W.G. (1977) Sampling Techniques. Third edition. John Wiley