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. Would you please help me to fix
it? Mnay thanks for your help.:)

Best regards,

Siqi

	[[alternative HTML version deleted]]


