. infile tot gun using murder96 (28 observations read) . generate year = 1965 + _n . generate pct = 100*gun/tot (2 missing values generated) . gen nogun = tot-gun (2 missing values generated) . gen before83 = (year<1983) . list year tot gun nogun pct in 1/8 year tot gun nogun pct 1. 1966 715 446 269 62.37762 2. 1967 810 528 282 65.18519 3. 1968 824 532 292 64.56311 4. 1969 711 489 222 68.77637 5. 1970 864 615 249 71.18056 6. 1971 970 669 301 68.96907 7. 1972 818 552 266 67.48166 8. 1973 814 502 312 61.67076 . graph tot year . graph gun year . graph pct year . graph pct year . ta before83 before83 | Freq. Percent Cum. ------------+----------------------------------- 0 | 11 39.29 39.29 1 | 17 60.71 100.00 ------------+----------------------------------- Total | 28 100.00 . ta before83 [freq=gun] before83 | Freq. Percent Cum. ------------+----------------------------------- 0 | 4830 35.88 35.88 1 | 8631 64.12 100.00 ------------+----------------------------------- Total | 13461 100.00 . ta before83 [freq=nogun] before83 | Freq. Percent Cum. ------------+----------------------------------- 0 | 2496 33.73 33.73 1 | 4905 66.27 100.00 ------------+----------------------------------- Total | 7401 100.00 . save murder96 file murder96.dta saved . stack gun year nogun year, into(homicide yr) clear . rename _stack gun . list in 1/8 homicide yr gun 1. 446 1966 1 2. 528 1967 1 3. 532 1968 1 4. 489 1969 1 5. 615 1970 1 6. 669 1971 1 7. 552 1972 1 8. 502 1973 1 . describe Contains data from :Macintosh HD:Applications:Stata5:ST_010002.tmp obs: 56 vars: 3 9 Jan 1997 09:16 size: 784 (99.8% of memory free) ------------------------------------------------------------------------------- 1. homicide float %9.0g 2. yr float %9.0g 3. gun int %8.0g ------------------------------------------------------------------------------- Sorted by: Note: data has changed since last save . gen before83 = (yr<1983) . ta before83 gun [freq=homicide], chi2 | gun before83 | 1 2 | Total -----------+----------------------+---------- 0 | 4830 2496 | 7326 1 | 8631 4905 | 13536 -----------+----------------------+---------- Total | 13461 7401 | 20862 Pearson chi2(1) = 9.7447 Pr = 0.002 . ta yr gun [freq=homicide], chi2 | gun yr | 1 2 | Total -----------+----------------------+---------- 1966 | 446 269 | 715 1967 | 528 282 | 810 1968 | 532 292 | 824 1969 | 489 222 | 711 1970 | 615 249 | 864 1971 | 669 301 | 970 1972 | 552 266 | 818 1973 | 502 312 | 814 1974 | 528 295 | 823 1975 | 501 286 | 787 1976 | 543 313 | 856 1977 | 551 312 | 863 1978 | 546 331 | 877 1979 | 380 288 | 668 1980 | 429 300 | 729 1981 | 442 299 | 741 1982 | 378 288 | 666 1983 | 419 325 | 744 1984 | 374 317 | 691 1985 | 390 270 | 660 1986 | 433 309 | 742 1987 | 602 247 | 849 1988 | 641 281 | 922 1989 | 652 289 | 941 1990 | 627 220 | 847 1991 | 692 238 | 930 -----------+----------------------+---------- Total | 13461 7401 | 20862 Pearson chi2(25) = 276.7427 Pr = 0.000 . clear . tabi 20 24 80 82\22 38 104 125\13 28 81 113\7 18 54 92, all | col row | 1 2 3 4 | Total -----------+--------------------------------------------+---------- 1 | 20 24 80 82 | 206 2 | 22 38 104 125 | 289 3 | 13 28 81 113 | 235 4 | 7 18 54 92 | 171 -----------+--------------------------------------------+---------- Total | 62 108 319 412 | 901 Pearson chi2(9) = 11.9886 Pr = 0.214 likelihood-ratio chi2(9) = 12.0369 Pr = 0.211 Cramer's V = 0.0666 gamma = 0.1265 ASE = 0.041 Kendall's tau-b = 0.0876 ASE = 0.028