HI EVERYONE;
i have a problem with emerging some dataset files
when i run the command
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. merge m:1 code using "E:\data\DATA\all_data\regional_data.dta"
i get the following error message
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variable code does not uniquely identify observations in the using data
when i check my data there is no duplication and i run the command describe
the results came out as follow(master file)
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              storage   display    value
variable name   type    format     label      variable label
--------------------------------------------------------------------------------------------------------------------
code            double  %12.0g                code
year            double  %12.0g                year
as for merged file the results as follows:
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--------------------------------------------------------------------------------------------------------------------
              storage   display    value
variable name   type    format     label      variable label
--------------------------------------------------------------------------------------------------------------------
code            double  %12.0g                code
please someone help solving such an issue