Drawing an ROC curve

#1
If I have values for `sensitivity` and `specificity` fora group of studies for example like this:

sensitivity specificity
----------- -----------
66.3% 74.7%
87.2% 65.9%
56.4% 76.4%
79.5% 94.3%

How can I make an `ROC` curve for such values? Do I divide them by `100` for example and just put the values in the curve straightforward? Or, how exactly does the process work out?

Thanks.
 

Masteras

TS Contributor
#2
the roc curves are y-axis sensitivity and x-axis 1-specificity or 100-specificity. Then you just plot the numbers and connect them with a line to see how it goes.
 
#3
the roc curves are y-axis sensitivity and x-axis 1-specificity or 100-specificity. Then you just plot the numbers and connect them with a line to see how it goes.
Thanks a lot for your clarification. But, shouldn't I divide the values I have by 100? As I saw some curves and the range for sensitivity and specificity was 0-1.
 
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