[R] Is there a function for this?

Andreas Hary andreashary at googlemail.com
Wed Jan 3 16:30:45 CET 2007

Try the following:

act <- c('good','good','bad','bad','good','good','bad','bad')
pred <- c('good','bad','bad','bad','good','good','good','bad')



On 1/3/07, Feng Qiu <hustqiufeng at sohu.com> wrote:
> Hi everybody, I'm trying to do a statistic on the error rate of a prediction
> algorithm.
> suppose this is the real category
> [good, good, bad, bad, good, good, bad, bad]
> this is the predicted category
> [good, bad, bad, bad, good, good, good, bad]
> I'm trying to do a statistic on the error rate for each group("good","bad"):
> what percentage of instances are predicted incorrectly for each group ?
> Of course I can write a loop to do that, but is there a easy way to do that?
> Thank you!
> Best,
> Feng
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