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st: How can I find the sum of specific values of a variable?
I have a dataset like the following, where the SIC values are in an ascending order
What I want to find is the sum of EXP values that have a SIC value begining with 20, i.e. 667.8039+130.8002+..+38.90306+0.617763
In others words I have some 4digit SIC data and I want to aggregate them into 2digit SIC.
Any hint is really appreciated
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