Hi, I want to run something like
SELECT firm_id, count(*), mean(value), sd(value)
FROM table
GROUP BY firm_id;
But I have to write a for loop like
for ( id in unique(table$firm_id ) {
print(paste( id, mean(table[firm_id == id, "value"]) ))
}
Is there any way to do it easier? Thanks :)
Best,
Reeyarn Lee
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