Nick Cox
2020-12-07 16:59:12
请注意，这collapse (lastnm) Gini variable*, by(iso3c)是一种单线解决方案。
让我们还展示如何从基本原理中获得相似的东西。
一旦将非缺失排序到面板的末尾（临时），就可以访问每个面板中的最后一个非缺失值。如果没有非缺失值可用，则必然会返回缺失值。
clear
input str3 iso3c year Gini variable1 variable2 variable3
AND 2000 . 1.279314 33 22
AND 2001 22 2.571869 . .
AND 2002 . 3.492054 . .
AND 2003 44 3.89996 . .
end
gen OK = .
foreach v in Gini variable1 variable2 variable3 {
replace OK = !missing(`v')
bysort iso3c (OK year) : gen `v'_lnm = `v'[_N]
}
sort iso3c year
list iso3c year *lnm
+----------------------------------------------------------+
| iso3c year Gini_lnm va~1_lnm va~2_lnm va~3_lnm |
|----------------------------------------------------------|
1. | AND 2000 44 3.89996 33 22 |
2. | AND 2001 44 3.89996 33 22 |
3. | AND 2002 44 3.89996 33 22 |
4. | AND 2003 44 3.89996 33 22 |
+----------------------------------------------------------+
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