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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.

How to sum over rows for all variables?
How to sum over rows for all variables?

So my data looks like this.

	y1999q1	y1999q2	y1999q3	y1999q4
US_a
US_b
US_c
CH_a
CH_b
CH_c

I want to create observations (US and CH) so that they are the sum of three observations. Intuitively, I want to make US = US_a + US_b + US_c. How do I do this?

The actual dataset is extremely large and with many different ids for the observations.

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How to sum over rows for all variables?

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