On Apr 25, 2014, at 10:58 AM, Si Qi L. wrote:
> Hi guys,
>
> I will be very grateful if you guys can do me a little favor on R. I am
> calculating the sensitivity and specificity for a 2*2 matrix, such as
>
> t
> 0 1
> 0 1427 110
> 1 271 166
>
>
>
> My codes are: sens <- function(ct) { ct[2,2] / sum(ct[,2]) }
> spec <- function(ct) { ct[1,1] / sum(ct[,1]) }
>
> But it doesn't show any numerical results.
What is the "it" that doesn't show any results? You show no code that uses
these functions and you don't even include a reproducible example for `t`.
(BTW using 't' as an object name may cause confusion since t() is a commonly
used matrix function.
> Would you please help me to fix
> it? Mnay thanks for your help.:)
>
> Best regards,
>
> Siqi
>
> [[alternative HTML version deleted]]
And please take the time to read the Posting Guide and learn to post in plain
text as requested there.
>
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David Winsemius
Alameda, CA, USA
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