hi,

  TN=0 in all cases, with this how can i plot the ROC, i need help in this regard.

thank you.

Date: Thu, 16 Aug 2012 09:47:20 -0700
From: ml-node+s789695n4640509h49@n4.nabble.com
To: vijayans@outlook.com
Subject: Re: no true negative data, need roc curve



	To clarify:


Is TN = 0 or do you not know TN (N)?


On 16.08.2012, at 11:51, vjyns wrote:


> Hi,

> 

>   I want to plot ROC curve for my detection algorithm which detects

> features in different images at two different thresholds.

> 

> 6 different images used and obtained tp, fp and fn. No tn in my case.

> 

> in first threshold run i obtained 6 values of tp,fp and fn. In second

> threshold run agian i got 6 more.

> 

> i had calculated tpr and fpr. How to plot ROC in this case. 

> 

> Is this possible to plot ROC curve in this case? If s, please guide me to

> plot that.

> 

> thank you.

> 

> http://r.789695.n4.nabble.com/file/n4640474/in1.png 

> 

> 

> 

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