QUALITY ESTIMATION OF CLICK-EVOKED OTOACOUSTIC EMISSIONS

Quality estimation of click-evoked oto-acoustic emissions. Lutman, M.E. and Sheppard, S. (MRC Institute of Hearing Research. Nottingham Clinical Outstation, General Hospital. Nottingham, England), Scand Audiol 1990, 19(3-7), The Fp statistic used by Elberling & Don (1984) as a quality estimator for averaged ABR recordings has been applied to averaged click-evoked oto-acoustic emissions. This statistic is akin to signal-to-noise ratio. The sampling distribution of Fsp under the null hypothesis that no signal is present has been determined by using no-stimulus trials. A determination by multiple replications in three normally-hearing adults demonstrated significant inter-subjeet variation, leading to a larger experiment in 58 children. From the latter experiment, the sampling distribution across subjects allowed the setting of a criterion value for Fsp of 2.0 which was only exceeded on 1 % of trials. Thus, values above this criterion would indicate the prese ‘ce of a signal in the average with a probability of Type 1 error below 1 %. When two consecutive averages both exceeded an Fsp of 1.6 the probability of Type 1 error was also below 1%. © 1990, Informa UK Ltd. All rights reserved.