list
//
// +-------------------------------------------------------------------------------------------------------------------+
// | make price mpg rep78 headroom trunk weight length turn displa~t gear_r~o foreign |
// |-------------------------------------------------------------------------------------------------------------------|
// 1. | AMC Concord 4,099 22 3 2.5 11 2,930 186 40 121 3.58 Domestic |
// 2. | AMC Pacer 4,749 17 3 3.0 11 3,350 173 40 258 2.53 Domestic |
// 3. | AMC Spirit 3,799 22 . 3.0 12 2,640 168 35 121 3.08 Domestic |
// 4. | Buick Century 4,816 20 3 4.5 16 3,250 196 40 196 2.93 Domestic |
// 5. | Buick Electra 7,827 15 4 4.0 20 4,080 222 43 350 2.41 Domestic |
// |-------------------------------------------------------------------------------------------------------------------|
// 6. | Buick LeSabre 5,788 18 3 4.0 21 3,670 218 43 231 2.73 Domestic |
// 7. | Buick Opel 4,453 26 . 3.0 10 2,230 170 34 304 2.87 Domestic |
// 8. | Buick Regal 5,189 20 3 2.0 16 3,280 200 42 196 2.93 Domestic |
// 9. | Buick Riviera 10,372 16 3 3.5 17 3,880 207 43 231 2.93 Domestic |
// +-------------------------------------------------------------------------------------------------------------------+
//描述mpg,总结其类型 范围 值分为几类，每类出现的次数 有几个缺失值
codebook mpg
//
// ------------------------------------------------------------------------------------------------------------------
// mpg Mileage (mpg)
// ------------------------------------------------------------------------------------------------------------------
//
// Type: Numeric (int)
//
// Range: [15,26] Units: 1
// Unique values: 7 Missing .: 0/9
//
// Tabulation: Freq. Value
// 1 15
// 1 16
// 1 17
// 1 18
// 2 20
// 2 22
// 1 26
