创建一个与 n-1 不同的变量,命名为 dvariable
Create a variable which is the difference with n-1 and is named dvariable
我想做这样的事情:
ds, has(type numeric)
foreach var in `r(varlist)' {
gen `var' = `var' - `var'[_n-1]
}
我想简单地命名新变量 d+oldname
。
如何将这两个愿望结合起来?
我认为您正在寻找的可能是以下几行:
sysuse auto, clear
ds, has(type numeric)
foreach var in `r(varlist)' {
quietly generate d`var' = `var' - `var'[_n-1]
display ""
display "`var'"
display "d`var'"
}
这将产生:
price
dprice
mpg
dmpg
rep78
drep78
headroom
dheadroom
trunk
dtrunk
weight
dweight
length
dlength
turn
dturn
displacement
ddisplacement
gear_ratio
dgear_ratio
foreign
dforeign
我想做这样的事情:
ds, has(type numeric)
foreach var in `r(varlist)' {
gen `var' = `var' - `var'[_n-1]
}
我想简单地命名新变量 d+oldname
。
如何将这两个愿望结合起来?
我认为您正在寻找的可能是以下几行:
sysuse auto, clear
ds, has(type numeric)
foreach var in `r(varlist)' {
quietly generate d`var' = `var' - `var'[_n-1]
display ""
display "`var'"
display "d`var'"
}
这将产生:
price
dprice
mpg
dmpg
rep78
drep78
headroom
dheadroom
trunk
dtrunk
weight
dweight
length
dlength
turn
dturn
displacement
ddisplacement
gear_ratio
dgear_ratio
foreign
dforeign