stata显示指定类型的变量名

//只显示字符型变量名 string  numeric int float numlist
. ds,has(type string) 
make

. retu list

macros:
            r(varlist) : "make"
            
ds,has(format *f)

// headroom    gear_ratio
显示所有带有标签的变量名

. ds,has(varlabel)
make          rep78         weight        displacement
price         headroom      length        gear_ratio
mpg           trunk         turn          foreign
显示所有带有值标签的变量名
. ds,has(vallabel)
foreign