name of dataset: prison
no of variables: 45
no of observations: 714

+----------+---------------------------------+
| variable | label                           |
+----------+---------------------------------+
| state    | alphabetical; DC = 9            |
| year     | 80 to 93                        |
| govelec  | =1 if gubernatorial election    |
| black    | proportion black                |
| metro    | proportion in metro. areas      |
| unem     | proportion unemployed           |
| criv     | viol. crimes per 100,000        |
| crip     | prop. crimes per 100,000        |
| lcriv    | log(criv)                       |
| lcrip    | log(crip)                       |
| gcriv    | lcriv - lcriv_1                 |
| gcrip    | lcrip - lcrip_1                 |
| y81      | =1 if year == 81                |
| y82      |                                 |
| y83      |                                 |
| y84      |                                 |
| y85      |                                 |
| y86      |                                 |
| y87      |                                 |
| y88      |                                 |
| y89      |                                 |
| y90      |                                 |
| y91      |                                 |
| y92      |                                 |
| y93      |                                 |
| ag0_14   | prop. pop. 0 to 14 yrs          |
| ag15_17  | prop. pop. 15 to 17 yrs         |
| ag18_24  | prop. pop. 18 to 24 yrs         |
| ag25_34  | prop. pop. 25 to 34 yrs         |
| incpc    | per capita income, nominal      |
| polpc    | police per 100,000 residents    |
| gincpc   | log(incpc) - log(incpc_1)       |
| gpolpc   | lpolpc - lpolpc_1               |
| cag0_14  | change in ag0_14                |
| cag15_17 | change in ag15_17               |
| cag18_24 | change in ag18_24               |
| cag25_34 | change in ag25_34               |
| cunem    | change in unem                  |
| cblack   | change in black                 |
| cmetro   | change in metro                 |
| pris     | prison pop. per 100,000         |
| lpris    | log(pris)                       |
| gpris    | lpris - lpris[_n-1]             |
| final1   | =1 if fnl dec on litig, curr yr |
| final2   | =1 if dec on litig, prev 2 yrs  |
+----------+---------------------------------+

S.D. Levitt (1996), “The Effect of Prison Population Size on Crime
Rates: Evidence from Prison Overcrowding Legislation,” Quarterly
Journal of Economics 111, 319-351. Professor Levitt kindly provided me
with the data, of which I used a subset.