求如何用stata实现样本匹配

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有一份数据，要求对每一个POLICY=1的样本找4个POLICY=0的配对样本满足YEAR SIC2 DP相同然后FS最接近，求出配对样本的MB  TA CHR 的，与样本进行比较，该怎么做呀，不知道数据格式有没有错误，看了之前voodoo的一些帖子回复，不明白呀，太笨了，求哥各位大身帮帮忙～
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关键词：Stata tata 如何用 Policy 配对样本 如何 样本

MB TA CHR 的 mean

1. create two datasets from orignial dataset - dataset with policy =1 and dataset with policy = 0
2. use joinby to link all of possible matched observations
3. Check for the closest 4 observations based on FS

ctx5518 发表于 2013-8-5 11:58
1. create two datasets from orignial dataset - dataset with policy =1 and dataset with policy = 0
2 ...

sorry, How to conduct the thrid step, I am a beginner for stata~

1. When you create the two dataset, rename the FS and other variables to different name, for example FS to FS1 if policy  = 1, and do not need to change the matching variable name.
2. After the joinby, generate the difference between FS and FS1, you may take the absolute value for the difference
3. bysort  EAR SIC2 DP (difference): keep if _n == 4

ctx5518 发表于 2013-8-6 08:37
1. When you create the two dataset, rename the FS and other variables to different name, for example ...

cheers~

ctx5518 发表于 2013-8-6 08:37
1. When you create the two dataset, rename the FS and other variables to different name, for example ...

可是这样joinby之后他们不在同一行中，如何进行做差呢