A method for use in the fitting of a hearing aid comprises the steps of providing a sound recording of a user environment, feeding the sound recording to the hearing aid as a sound input signal (8a), processing the sound input signal according to a scheme defined by preselected settings of a number of parameters so as to provide a processed signal (8b), adjusting the setting of at least one parameter, performing a statistical analysis of the magnitude of the processed signal or of the input signal in at least one frequency band, which statistical analysis is reset when a parameter is adjusted during the fitting, and displaying a graphical representation (10, 11) of the results of said statistical analysis. The invention also provides a system for fitting a hearing aid and a hearing aid.