Sir, how to calculate EER equal error rate for the following data

respected sir, I have used following formula for calculating false acceptance rate FAR and FRR FAR=FP/(FP+TN) FRR=FN/(TP+FN) GAR=1-FRR my question is how to calculate equal error rate EER using following data

                TP  FP  FN  TN  FAR  FRR
Actual_class1  4  1  0  35  36  0
Actual_class2  4  4  0  32  33  0
Actual_class3  1  1  3  35  36  6
Actual_class4  4  1  0  35  36  0
Actual_class5  2  0  2  36  #DIV/0!  3
Actual_class6  4  0  0  36  #DIV/0!  0
Actual_class7  3  0  1  36  #DIV/0!  1.333333333
Actual_class8  2  1  2  35  36  3
Actual_class9  4  0  0  36  #DIV/0!  0
Actual_class10  4  0  0  36  #DIV/0!  0
mean  3.2  0.8  0.8  35.2    
            
    FAR  0.022222222      
    FRR  0.2      
    GAR  80  %

[KALYAN ACHARJYA]

Do you have any mathematical formula to calculate EER? if you have it, provide us, we can help you to implement in Matlab.

[Balaji M. Sontakke]

Sir, Is it possible to calculate EER using some formula in Matlab, how I can? please help me

Answer 1

[KALYAN ACHARJYA]

Based on my basic knowledge: EER is the value where FRR and FAR intersect

So you can draw the plot FRR

Also, you can draw the plot FAR

The intersection of both curves gives the EER

Have you check here?

Also here

[Balaji M. Sontakke]

Sir, Firstly I want to know that, whichever formulas I used for calculating FAR and FRR are correct or not. secondly, I don't know the thresh values which I help us to calculate EER, so can you please guide me regarding it.

[KALYAN ACHARJYA]

Just plot two curves, there are multiple ways, you can find the intersection between two curves?

Any help needed, let me know here?

[Balaji M. Sontakke]

Sir, I plot the curve using the following code.. clc; clear all;

FAR=[0.027777778,0.111111111,0.027777778,0.027777778,0,0,0,0.027777778,0,0]; FRR=[0,0,6,0,3,0,1.333333333,3,0,0]; plot(FAR)

figure, plot(FRR)

idx = find(FAR - FRR < eps, 1); %// Index of coordinate in array px = FAR(idx); py = FRR(idx); figure, plot(px,py,'or','MarkerSize',18);

still am not getting the intersection of two curves, please help