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.

egen mean_var = mean(var), by(xx & xx)
egen mean_var = mean(var), by(xx & xx)

Hi

How do I generate a mean variable sorted by both year and origin?

I want to generate the mean value of a variable by month and by origin

My best suggestion is:

egen mean_var = mean(var), by(month & origin)

but Stata says "& invalid name"

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