BJ Data Tech Solution

Specialized on Data processing, Data management Implementation plan, Data Collection tools - electronic and paper base, Data cleaning specifications, Data extraction, Data transformation, Data load, Analytical Datasets, and Data analysis. BJ Data Tech Solutions teaches on design and developing Electronic Data Collection Tools using CSPro, and STATA commands for data manipulation. Setting up Data Management systems using modern data technologies such as Relational Databases, C#, PHP and Android.

data merge: r(459);
data merge: r(459);

Hi,
I have two panel data-set and what to merge the two data set. I use the following code but I receive the error "r(459); variable firmid does not uniquely identify observations in the master data". I double-checked for duplicate observation and no duplicate observation reported. I would be grateful if you help regarding the error.

Code: megre dataset1 with dataset2
merge 1:1 firmid using dataset2
or
merge m:1 firmid using dataset2

Kindly,
Mahmoud

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