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Applied Statistics (2008)
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BibTeX
@MISC{Li08appliedstatistics,
author = {Yiwen Li and Dr. Bogdan Vernescu and Department Head},
title = {Applied Statistics},
year = {2008}
}
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Abstract
Auditory Steady-State Response (ASSR) is a promising tool for detecting hearing loss. In this project, we analyzed hearing threshold data obtained from two ASSR methods and a gold standard, pure tone audiometry, applied to both normal and hearing-impaired subjects. We constructed a repeated measures linear model to identify factors that show significant differences in the mean response. The analysis shows that there are significant differences due to hearing status (normal or impaired) and ASSR method, and that there is a significant interaction between hearing status and test signal frequency. The second task of this project was to predict the PTA threshold (gold standard) from the ASSR-A and ASSR-B thresholds separately at each frequency, in order to measure how accurate the ASSR measurements are and to obtain a “correction function ” to correct the bias in the ASSR measurements. We used two approaches. In the first, we modeled the relation of the PTA responses to the ASSR values for the two hearing status groups as a mixture model and tried two prediction methods. The mixture modeling was successful, but the predictions gave disappointing results. A second approach, using logistic regression to predict group membership based on ASSR value and then using those predictions to obtain a predictor of the PTA value, gave successful results.
Keyphrases
applied statistic significant difference assr measurement assr method assr value gold standard second approach successful result test signal frequency group membership hearing-impaired subject prediction method pta response assr-b threshold pta threshold mixture model repeated measure mixture modeling pure tone audiometry auditory steady-state response pta value hearing status group promising tool threshold data mean response significant interaction second task hearing loss logistic regression disappointing result correction function
