MURDER.DES id state year mrdrte exec unem d90 d93 cmrdrte cexec cunem cexec_1 cunem_1 Obs: 153 1. id state identifier 2. state postal code 3. year 87, 90, or 93 4. mrdrte murders per 100,000 population 5. exec total executions, past 3 years 6. unem annual unem. rate 7. d90 =1 if year == 90 8. d93 =1 if year == 93 9. cmrdrte mrdrte - mrdrte[t-1] 10. cexec exec - exec[t-1] 11. cunem unem - unem[t-1] 12. cexec_1 cexec[t-1] 13. cunem_1 cunem[t-1]