在Stata中拆分字符串变量，并按顺序放置值

在Stata中拆分字符串变量通常很容易。然而，在我的例子中，我很难重新组织这些值的顺序。变量表示与观察相关的特征列表，如下所示：

Variable_Name
No Phosphates
No Perfumes; No Phosphates; Private Label
No Perfumes; Private Label
Private Label

如果我使用代码

分割变量_Name，p（“；”）

，我得到

Variable_Name1      Variable_Name2      Variable_Name2 
No Phosphates              
No Perfumes         No Phosphates       Private Label
No Perfumes         Private Label       
Private Label

如何重新排列这些值，使其看起来像这样

Variable_Name1      Variable_Name2        Variable_Name3        
No Phosphates              
No Phosphates       No Perfumes            Private Label
                    No Perfumes            Private Label      
                                           Private Label

换句话说，如何在同一列下对相同的特征进行分组

以下是完整的代码：

clear
input str50 Variable_Name 
"No Phosphates"
"No Perfumes; No Phosphates; Private Label"
"No Perfumes; Private Label"
"Private Label"
end

split Variable_Name, p("; ")

我面临的挑战是，我有许多未知的特征。我不可能手动识别它们并将它们排序到列中，也不可能查找某些字符串值。

请参阅一些

重塑

技术。请注意，这将对拼写等方面的细微差异完全敏感

clear 
input str100 what 
"No Phosphates"
"No Perfumes; No Phosphates; Private Label"
"No Perfumes; Private Label"
"Private Label"
end 
split what, p(;) 
rename what original 
gen id = _n
reshape long what, i(id) 
replace what = trim(what) 
egen group = group(what) 
drop if missing(group) 
drop _j 
reshape wide what, i(id) j(group) 
list 

请参阅以了解一些

重塑
技术。请注意，这将对拼写等方面的细微差异完全敏感

clear 
input str100 what 
"No Phosphates"
"No Perfumes; No Phosphates; Private Label"
"No Perfumes; Private Label"
"Private Label"
end 
split what, p(;) 
rename what original 
gen id = _n
reshape long what, i(id) 
replace what = trim(what) 
egen group = group(what) 
drop if missing(group) 
drop _j 
reshape wide what, i(id) j(group) 
list