怎么查找变量中的某个值

The following is a better one to convert the string "id" variable:

destring id, gen (id_n1)

then change the last command as follows:

collapse (sum) export (min) id_min=id_n1 (max) id_max=id_n1, by(group)

hplcdadong 发表于 2012-4-4 05:15
The following is a better one to convert the string "id" variable:

destring id, gen (id_n1)

刚才有试了一下。出现了r(111) error . . . . . . . . . . . . . . . . . . . . . . . .  Return code 111
        __________ not found;
        no variables defined;
        The variable does not exist.  You may have mistyped the
        variable's name.
        variables out of order;
        You specified a varlist containing varname1-varname2, yet
        varname1 occurs after varname2.  Reverse the order of the
        variables if you did not make some other typographical error.
        Remember, varname1-varname2 is taken by Stata to mean varname1,
        varname2, and all the variables in dataset order in between.
        Type describe to see the order of the variables in your dataset.
        __________ not found in using data;
        You specified a varlist with merge, yet the variables on which
        you wish to merge are not found in the using dataset, so the
        merge is not possible.
        __________ ambiguous abbreviation;
        You typed an ambiguous abbreviation for a variable in your data.
        The abbreviation could refer to more than one variable.  Use a
        nonambiguous abbreviation or, if you intend all the variables
        implied by the ambiguous abbreviation, append a `*' to the end
        of the abbreviation.

学写了！