Roc curve demo
This presentation is the property of its rightful owner.
Sponsored Links
1 / 16

ROC Curve Demo PowerPoint PPT Presentation


  • 50 Views
  • Uploaded on
  • Presentation posted in: General

ROC Curve Demo. Say 1. Say 0. %1s. 1. 0. | |. %0s. |<-logits of the 1s->|. |. |<-logits of the 0s->|. Say 1. Say 0. Say 1. Say 0. Say 1. Say 0. Say 1. Say 0. Say 1. Say 0. Say 1. Say 0.

Download Presentation

ROC Curve Demo

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


ROC Curve Demo


Say

1

Say

0

%1s

1

0

| |

%0s

|<-logits of the 1s->|

|

|<-logits of the 0s->|


Say

1

Say

0


Say

1

Say

0


Say

1

Say

0


Say

1

Say

0


Say

1

Say

0


Say

1

Say

0


Say

1

Say

0


Example 2

0 1

Say 1

Say 0

X=10

X=13

X=16

1 - specificity


Example 2

0 1

X=10

X=13

X=16

Say 1

Say 0

(2/25, 18/35)

1 - specificity


Example 2

0 1

X=10

X=13

X=16

(10/25, 30/35)

(2/25, 18/35)

Say 1

Say 0

1 - specificity


Example 2

0 1

X=10

X=13

X=16

(10/25, 30/35)

(1, 1)

(2/25, 18/35)

Say 1

Say 0

1 - specificity


Example 2

0 1

X=10

X=13

X=16

Tie Tie

Say 1

Say 0

18 x 23

1 - specificity


Example 2

0 1

X=10

X=13

X=16

Tie Tie

15 x 12

Tie

Tie Tie

Say 1

Say 0

18 x 23

Tie

1 - specificity


Example 2

0 1

X=10

X=13

X=16

15x5/2

Tie Tie

8x12/2

Tie

15 x 12

Tie

Tie Tie

2x18/2

18 x 23

Tie Tie

Say 1

Tie

Say 0

1 - specificity

AUC Area Under Curve = concordant pair plus ½ ties (proportions)

Pairs: 25x35=875 with 0 paired with 1.

Proportion Concordant: (18x23+12x15)/(25x35)=(18/25)x(23/35)+(12/25)x(15/35)

½ Proportion Ties ½(2x18 + 8x12 + 15x5)/(25x35)

AUC = 697.5/875 = 0.7971.


  • Login