多次保存数据

Question

我正在用 Stata 写一些代码，我已经用过 preserve 一次。但是，现在我想再次 preserve，而不使用 restore。

我知道这会给出错误信息，但它会保存到新的保护区吗？

Answer 1

不，保留两次而不在中间恢复只会引发错误：

sysuse auto, clear

preserve
drop mpg

preserve
already preserved
r(621);

但是，您可以使用临时文件执行类似的操作。来自 help macro:

"...tempfile assigns names to the specified local macro names that may be used as names for temporary files. When the program or do-file concludes, any datasets created with these assigned names are erased..."

考虑以下玩具示例：

tempfile one two three

sysuse auto, clear
save `one'

drop mpg
save `two'

drop price
save `three'

use `two'
list price in 1/5

     +-------+
     | price |
     |-------|
  1. | 4,099 |
  2. | 4,749 |
  3. | 3,799 |
  4. | 4,816 |
  5. | 7,827 |
     +-------+

use `one'
list mpg in 1/5

     +-----+
     | mpg |
     |-----|
  1. |  22 |
  2. |  17 |
  3. |  22 |
  4. |  20 |
  5. |  15 |
     +-----+

多次保存数据

Preserving data more than once

stata

stata-macros