```On Mar 25, 9:11&#2013266080;am, "josef" <chuymv@n_o_s_p_a_m.gmail.com> wrote:
> I'm trying to use the coherence function using AR method. But the values
> obtained are greater than 1. I use the following equation:
>
> Cxy=abs(Pxy)^2/Pxx*Pyy
>
> where Pxx and Pyy are the obtained with the method AR. &#2013266080;Pxy is obtained as
> follows: &#2013266080;first, I use the cross correlation between the two signals. The
> result is evaluated with AR technique to obtain the Pxy
>
> I don't know if correct this. Someone can help me please
>
> Thank you for your attention

AR techniques - you mean solving the Yule-Walker equations I expect?
(having found the correlation coefficients first).
Yes should work but would be slow compared with FFT method (but more
smooth). How much greater than 1?

Hardy
```
```I'm need your help
I'm trying to use the coherence function using AR method. But the values
obtained are greater than 1. I use the following equation:

Cxy=abs(Pxy)^2/Pxx*Pyy

where Pxx and Pyy are the obtained with the method AR.  Pxy is obtained as
follows:  first, I use the cross correlation between the two signals. The
result is evaluated with AR technique to obtain the Pxy

I don't know if correct this. Someone can help me please