Creating the Statepop Data Set

 data statepop;     input State $ CityPop_80 CityPop_90           NonCityPop_80 NonCityPop_90 Region;     format region 1.;     label citypop_80=   '1980 metropolitan pop in millions'           noncitypop_80='1980 nonmetropolitan pop in millions'           citypop_90=   '1990 metropolitan pop in millions'           noncitypop_90='1990 nonmetropolitan pop in million'           region='Geographic region';     datalines;  ME     .405   .443   .721   .785  1  NH     .535   .659   .386   .450  1  VT     .133   .152   .378   .411  1  MA    5.530  5.788   .207   .229  1  RI     .886   .938   .061   .065  1  CT    2.982  3.148   .126   .140  1  NY   16.144 16.515  1.414  1.475  1  NJ    7.365  7.730    .A     .A   1  PA   10.067 10.083  1.798  1.799  1  DE     .496   .553   .098   .113  2  MD    3.920  4.439   .297   .343  2  DC     .638   .607      .      .  2  VA    3.966  4.773  1.381  1.414  2  WV     .796   .748  1.155  1.045  2  NC    3.749  4.376  2.131  2.253  2  SC    2.114  2.423  1.006  1.064  2  GA    3.507  4.352  1.956  2.127  2  FL    9.039 12.023   .708   .915  2  KY    1.735  1.780  1.925  1.906  2  TN    3.045  3.298  1.546  1.579  2  AL    2.560  2.710  1.334  1.331  2  MS     .716   .776  1.805  1.798  2  AR     .963  1.040  1.323  1.311  2  LA    3.125  3.160  1.082  1.060  2  OK    1.724  1.870  1.301  1.276  2  TX   11.539 14.166  2.686  2.821  2  OH    8.791  8.826  2.007  2.021  3  IN    3.885  3.962  1.605  1.582  3  IL    9.461  9.574  1.967  1.857  3  MI    7.719  7.698  1.543  1.598  3  WI    3.176  3.331  1.530  1.561  3  MN    2.674  3.011  1.402  1.364  3  IA    1.198  1.200  1.716  1.577  3  MO    3.314  3.491  1.603  1.626  3  ND     .234   .257   .418   .381  3  SD     .194   .221   .497   .475  3  NE     .728   .787   .842   .791  3  KS    1.184  1.333  1.180  1.145  3  MT     .189   .191   .598   .608  4  ID     .257   .296   .687   .711  4  WY     .141   .134   .329   .319  4  CO    2.326  2.686   .563   .608  4  NM     .675   .842   .628   .673  4  AZ    2.264  3.106   .453   .559  4  UT    1.128  1.336   .333   .387  4  NV     .666  1.014   .135   .183  4  WA    3.366  4.036   .776   .830  4  OR    1.799  1.985   .834   .858  4  CA   22.907 28.799   .760   .961  4  AK     .174   .226   .227   .324  4  HI     .763   .836   .202   .272  4  ;