Frequencies for countyfips variable in countymd1989 dataset : 3-digit | County FIPS | code | Freq. Percent Cum. ------------+----------------------------------- 000 | 1 4.00 4.00 001 | 1 4.00 8.00 003 | 1 4.00 12.00 005 | 1 4.00 16.00 009 | 1 4.00 20.00 011 | 1 4.00 24.00 013 | 1 4.00 28.00 015 | 1 4.00 32.00 017 | 1 4.00 36.00 019 | 1 4.00 40.00 021 | 1 4.00 44.00 023 | 1 4.00 48.00 025 | 1 4.00 52.00 027 | 1 4.00 56.00 029 | 1 4.00 60.00 031 | 1 4.00 64.00 033 | 1 4.00 68.00 035 | 1 4.00 72.00 037 | 1 4.00 76.00 039 | 1 4.00 80.00 041 | 1 4.00 84.00 043 | 1 4.00 88.00 045 | 1 4.00 92.00 047 | 1 4.00 96.00 510 | 1 4.00 100.00 ------------+----------------------------------- Total | 25 100.00 by Jean Roth , jroth@nber.org , 23 Jun 2017