Population of U.S. Cities

SUMMARY:
       The 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 DESCRIPTION:
       This data frame contains the following columns:

u:     The 1920 population.
x:     The 1930 population.

SOURCE:
       The data were obtained from

       Cochran, W.G. (1977) Sampling Techniques.  Third  edition.
       John Wiley

OTHER REFERENCES:
       Davison, A.C. and Hinkley, D.V. (1997)  Bootstrap  Methods
       and Their Application. Cambridge University Press.