黃河泉 发表于 2016-8-16 08:09 
1. 你那个 merge "n":1 不太对吧！应该是 "m"！
2. 分别到 dataset6 与 dataset7 中，执行 sum 并将结果 ...
我改了m也还是提醒这个
dataset6 sum Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
Year | 1183 2012 2.000846 2009 2015
stkcd | 1183 88.10059 50.01803 1 173
Size | 1183 34.65317 44.94873 0 729.6928
Grow | 1183 .2369453 1.047298 -.9153 29.3057
Lev | 1182 41.2376 21.79373 3.0542 237.3457
-------------+--------------------------------------------------------
Cash | 1183 1.38507 15.02599 -371.4217 81.0842
ROA | 1183 8.934413 8.260624 -25.4168 65.7294
I | 1183 .2237261 .1346058 .0007 .6746
i0 | 1183 .228669 .1351826 .0007 .6883
J | 2 .18 .0411536 .1509 .2091
-------------+--------------------------------------------------------
K | 2 .25955 .0378302 .2328 .2863
L | 2 .36265 .4333857 .0562 .6691
M | 1 .1165 . .1165 .1165
N | 1 .1746 . .1746 .1746
O | 1 .4831 . .4831 .4831
-------------+--------------------------------------------------------
P | 1 .1119 . .1119 .1119
Q | 0
R | 0
S | 0
T | 8 .0645 .0265233 .0288 .1151
-------------+--------------------------------------------------------
U | 8 .2444625 .0192213 .2124 .2724
V | 8 .2430125 .0497397 .1822 .3395
data7 sum
Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
city | 0
mayor | 0
Term | 91 3.505495 1.068474 2 6
Age | 91 49.12088 3.210521 42 58
Pro | 91 .6813187 .4685467 0 1
-------------+--------------------------------------------------------
Spro | 91 .6373626 .4834249 0 1
Source | 91 .5164835 .5024968 0 1
Edu | 91 2.076923 .4995725 1 3
year | 91 2011.308 2.493067 2005 2015
F | 0
，解决了，谢谢你
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