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我有一个简单的数据,看起来像这样首先填充空白。在SAS
+----------+------+--------+
| cis_code | yymm | sector |
+----------+------+--------+
| CTAGBTH | 1707 | BANK |
| CTAGBTH | 1706 | |
| CTAGBTH | 1705 | |
| CTAGBTH | 1703 | |
| CTAGBTH | 1702 | RETAIL |
| CTAGBTH | 1701 | |
| CTAGBTH | 1612 | |
| CTAGBTG | 1703 | |
| CTAGBTG | 1702 | AGRI |
| CTAGBTG | 1701 | |
| CTAGBTG | 1612 | RETAIL |
| CTAGBET | 1705 | |
| CTAGBET | 1510 | FSI |
| CTAGBET | 1504 | |
+----------+------+--------+
在这个问题
我想创建一个新的变量sector_summary其中空白应该通过与cid_code变化的行业所取代。我曾尝试使用first.yymm和first.sector,但不幸的是没有任何工作。我也尝试了一些if语句,但不确定if语句是否适用于所有条件。该数据应该是这样的
+-----------+-------+---------+---------------+
| cis_code | yymm | sector | Sector_Group |
+-----------+-------+---------+---------------+
| CTAGBET | 1705 | | |
| CTAGBET | 1510 | FSI | FSI |
| CTAGBET | 1504 | | FSI |
| CTAGBTG | 1703 | | |
| CTAGBTG | 1702 | AGRI | AGRI |
| CTAGBTG | 1701 | | AGRI |
| CTAGBTG | 1612 | RETAIL | RETAIL |
| CTAGBTH | 1707 | BANK | BANK |
| CTAGBTH | 1706 | | BANK |
| CTAGBTH | 1705 | BANK | |
| CTAGBTH | 1703 | BANK | |
| CTAGBTH | 1702 | RETAIL | RETAIL |
| CTAGBTH | 1701 | | RETAIL |
| CTAGBTH | 1612 | | RETAIL |
+-----------+-------+---------+---------------+
所以基本上,如果没有为给定YYMM一个空白扇区的扇区群也将是空白随之而来的几个月之前,除非有其被替换另一个部门,这将在接下来的几个月里会继续在那里。
请让我知道如何去做