fatherberry 发表于 2014-1-6 23:29 
证明里面包含了非数值的记录。如果用destring var,force replace,这些转化不了的就会变成缺失值。
方法有效!
roa contains nonnumeric characters; roa replaced as double
(8 missing values generated)
com contains nonnumeric characters; com replaced as double
(9 missing values generated)
fage contains nonnumeric characters; fage replaced as double
(1 missing value generated)