How define Q-factor of filter in Agilent ADS

I have a selective characteristic of filter. How I can define formula of Q-factor in Agilent ADS?
I can define resonance in dB
max(dB(AC.out))
but for calculate Q-factor i need use frequency of resonance in Hz, how do it?

The definition of the Q factor does not depend on the used software.
Do you speak about lowpass or bandpass response?

I said about bandpass filter. I solve this problem, formula for define Q-factor for bandpass filter is
Q=center_freq(db(S(2,1)),0.000000001)/bandwidth_func(db(S(2,1)),3,0)
where
center_freq(Data, ReferenceBW)
bandwidth_func(Data, DesiredValue, Type: 0 - Band-pass 1 - Band-stop 2 - Low-pass 3 - High-pass)