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What is wrong with as.numeric in R?

> X864291X8X74 [1] 8.0000000000 9.0000000000 10.0000000000 6.0000000000 8.0000000000 10 Levels: 0.0000000000 10.0000000000 12.0000000000 3.0000000000 4.0000000000 6.0000000000 ... NULL > as.numeric(X864291X8X74) [1] 8 9 2 6 8

What did I misunderstand? Shouldn't be the result of as.numeric 8 9 10 6 8?

How to get the right result?

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2 answers

Your vector factor . This question has been asked several times, for example: here , here , here . To convert a coefficient to a numeric one, you first need to convert to a character . Try:

 as.numeric(as.character(my_vec))
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The documentation in ?factor states:

To convert the coefficient f approximately the original numerical values, as.numeric(levels(f))[f] recommended and slightly more efficient than as.numeric(as.character(f)).

So the following works:

 as.numeric(levels(my_vec))[my_vec]
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