好像是矩阵问题?求解决
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, but 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.
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