你这个例子里用encode处理字符变数字是不合适的。请看看Stata对encode的说明：encode creates a new variable named newvar based on the string variable varname, creating, adding to, or just using (as necessary) the value label newvar or, if specified, name. Do not use encode if varname contains numbers that merely happen to be stored as strings; instead, use generate newvar = real(varname) or destring; see real() or [D]destring.
这个说的很明白了，“Do not use encode if varname contains numbers that merely happen to be stored as strings; instead, use generate newvar = real(varname) or destring;”
至于你用destring为什么出现问题，你的错误提示说明，你那个变量里面存在非数字的字符。你应该仔细检查一下，变量里存在什么字符。如果你确认这个变量就应该是数字，可以直接转换的话。那么，可以在destring后面加上force参数
destring var, replace force
force参数的作用是“convert nonnumeric strings to missing values”
shajia2008 发表于 2014-10-7 09:34
试一下encode varname, gen (newvarname)。varname是字符型变量，newvarname没问题的话就是转变后的数值型变 ...
encode在楼主的例子里面恐怕是不合适的，Stata的说明：
Do not use encode if varname contains numbers that merely happen to be stored as strings; instead, use generate newvar = real(varname) or destring
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