Frequencies for first 10,000 rows of security_t variable in vindecode dataset : (security type) description | Freq. Percent Cum. ----------------------------------------+----------------------------------- | 2,833 28.33 28.33 Active alarm system | 2 0.02 28.35 Active keyless entry | 173 1.73 30.08 IMMOBILIZER, KEYLESS ENTRY, AND ALARM | 2 0.02 30.10 Immobilizer | 110 1.10 31.20 Immobilizer / keyless entry / and alarm | 812 8.12 39.32 Immobilizer and alarm | 35 0.35 39.67 Immobilizer and keyless entry | 588 5.88 45.55 Keyless entry and alarm | 138 1.38 46.93 None | 780 7.80 54.73 Other | 828 8.28 63.01 Pass Key | 1,325 13.25 76.26 Passive engine immobilizer | 334 3.34 79.60 Passive sentry key | 80 0.80 80.40 Sentry key / keyless entry / and alarm | 426 4.26 84.66 Sentry key and alarm | 62 0.62 85.28 Sentry key and keyless entry | 248 2.48 87.76 Unknown | 1,224 12.24 100.00 ----------------------------------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016