Dear R epidemiologists,
The package help for the above function states:
Arguments X A 2x2 matrix, with Gold Standard Class A and B in the columns
and Comparison Method A and B in the rows.
I understood this to mean the following:
Gold standard
Comparison method A (neg) B (pos)
A (neg) 18 1
B (pos) 0 201
However, it gives the results backwards:
sensSpec(t1)
Simple Sensitivity and Specitivity Output
Input Matrix:
ref
r1a negative positive
negative 18 1
positive 0 201
The sample of sensitivity is: 100%
The sample of specificity is: 99.5%
but if you calculate the sensitivity and specificity by hand, sensitivity is
99.5 and specificity is 100%....
Many thanks,
Amy
--
Amy Mikhail
Program Manager, ACTc Afghanistan Malaria Project
London School of Hygiene & Tropical Medicine
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