how to compar AUC when it give negative value, I use trapz(x,y) to calculate it
39 ビュー (過去 30 日間)
古いコメントを表示
Q: when I calculate the area under curve using trapz function some of them was negative value ( so I thought parts below the axis are negative and those above are positive), I know because it is area we remove the sign. however in case I want to compare this auc with another auc, does I keep the sign or just take the absolute value ? thanks Amirah
4 件のコメント
the cyclist
2020 年 1 月 14 日
Do you mean if you flip a coin a number of times, and try to predict the outcome?
AUC is a number. It is the area under the curve -- not the curve itself. That number will always be positive.
Do you mean will the ROC curve be linear? On average, the curve will be linear from the bottom left to the upper right. But for any given experiment, it will deviate from that line, due to sampling error.
回答 (1 件)
Harshan Ravi
2021 年 1 月 5 日
Its the trapz function expects the input. The function requires vector in x axis in an increasing order and their values in corresponding y-axis. Eventhough, the order of the x and y doesnot matter for plotting, it is important for trapz.
0 件のコメント
参考
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!