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.

dropping observations if variable is zero between time period
dropping observations if variable is zero between time period

Hello,

Could someone please help me dropping some observations? I'm investigating the influence of patenting on the return on investment of firms. Now I want to drop the companies that never had a patent between variable fyear (fiscal year) 1997-2015 (see the example company in the screenshot). But I want to keep them if they had a patent in this time period. So, also if they only have 1 patent in that time period, I want to keep them in my dataset. I'm struggling to find the right code so could someone please help me?

Thanks!Array

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