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2007 Jul 21
2
avoiding timconsuming for loop renaming identifiers
Hi All
I was wondering if I can avoid a time-consuming for loop on my 600000 obs dataset.
school_id y
8 9.87
8 8.89
8 7.89
8 8.88
20 6.78
20 9.99
20 8.79
31 10.1
31 11
There are, say, 143 different schools in this 600000 obs dataset.
I need to thave sequential identifiers, 1,2,3,4,5,...,143.
I was using an...