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.

count number of unique values over a rolling time window defined by a date variable
count number of unique values over a rolling time window defined by a date variable

Dear Stata community,

I'd like to generate a variable that records the number of unique values of a variable (var1) within each value of another variable (var2) over a rolling time window defined by a date variable.I cannot really come up with codes that could provide the results I'm looking for. I wondered if anyone could provide some thoughts? Any help would be greatly appreciated.

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