sysuse auto, clear
// (1978 automobile data)
des
//
// Contains data from D:\Stata17\ado\base/a/auto.dta
// Observations: 74 1978 automobile data
// Variables: 12 13 Apr 2020 17:45
// (_dta has notes)
// --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
// Variable Storage Display Value
// name type format label Variable label
// --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
// make str18 %-18s Make and model
// price int %8.0gc Price
// mpg int %8.0g Mileage (mpg)
// rep78 int %8.0g Repair record 1978
// headroom float %6.1f Headroom (in.)
// trunk int %8.0g Trunk space (cu. ft.)
// weight int %8.0gc Weight (lbs.)
// length int %8.0g Length (in.)
// turn int %8.0g Turn circle (ft.)
// displacement int %8.0g Displacement (cu. in.)
// gear_ratio float %6.2f Gear ratio
// foreign byte %8.0g origin Car origin
// --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
// Sorted by: foreign
//自动将所有变量转换为其最有效的存储类型以节省内存和磁盘空间
compress
// variable mpg was int now byte
// variable rep78 was int now byte
// variable trunk was int now byte
// variable turn was int now byte
// variable make was str18 now str17
// (370 bytes saved)
des
//
// Contains data from D:\Stata17\ado\base/a/auto.dta
// Observations: 74 1978 automobile data
// Variables: 12 13 Apr 2020 17:45
// (_dta has notes)
// --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
// Variable Storage Display Value
// name type format label Variable label
// --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
// make str17 %-17s Make and model
// price int %8.0gc Price
// mpg byte %8.0g Mileage (mpg)
// rep78 byte %8.0g Repair record 1978
// headroom float %6.1f Headroom (in.)
// trunk byte %8.0g Trunk space (cu. ft.)
// weight int %8.0gc Weight (lbs.)
// length int %8.0g Length (in.)
// turn byte %8.0g Turn circle (ft.)
// displacement int %8.0g Displacement (cu. in.)
// gear_ratio float %6.2f Gear ratio
// foreign byte %8.0g origin Car origin
// --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
// Sorted by: foreign
// Note: Dataset has changed since last saved.
