On 01/30/2012 08:52 PM, Josiane NJIWA wrote:
Hello all,
I am very new to R and i am facing two problems. First i didn't succeed
changing the konsole language in english even after trying the line command set
language='en'.
I would like to plot ROC curves. I have a serie of 10 threshold tests that i do
for 10 patients. The prediction for the patients is always the same but the
status can change given to the considered threshold.
I have 11 columns of 10 rows, the first colums containing the10 lines of the
predicted status of the patients (0=cured, 1=non cured). Then follow 10 columns
(10 thresholds) containing the found status using the threshold.
Please do someone know how i can use those values with R to plot ROC curves?
Hi Josiane,
The function roc.from.table in the "epicalc" package will produce a
basic ROC curve. You will have to get the table that you send to the
function in the correct form. I think you will have to lay out the table
like this:
Predicted Above threshold
Threshold1 x x
Threshold2 x x
Threshold3 x x
Threshold4 x x
Threshold5 x x
Threshold6 x x
Threshold7 x x
Threshold8 x x
Threshold9 x x
Threshold10 x x
I may be quite wrong as I don't know exactly what the successive
threshold values may mean. You will probably want to run the function
with grid=FALSE.
Jim
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