 This paper presents a comprehensive overview of four non-parametric modal analysis methods in the frequency domain, peak-picking, pp, frequency domain decomposition, fdd, enhanced frequency domain decomposition, efdd, and frequency spatial domain decomposition, fsdd. The methods were applied to a study case and their performance was evaluated by comparing the results with those obtained from the free decay, fd, method. The modal frequencies, modal damping ratios, and modal shapes were calculated and compared. The results showed a high correlation between the modal frequencies obtained by the fd method and the other four methods, while there was a lower correlation between the modal damping ratios. This article was authored by Elsa Maria Cardenas and Luis Ulysses Medina.