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.
Saturday, December 28, 2019
How to keep whole group with a variable including 3 values
Hi
I have a panel data with firm and year.
I want to keep only firms that headquartered in US and at least have observations at 2000, 2001, and 2002.
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