Random forests based monitoring of human larynx using questionnaire data

Authors:
M. Bacauskiene;A. Verikas;A. Gelzinis;A. Vegiene
Affiliations:
Department of Electrical & Control Equipment, Kaunas University of Technology Studentu 50, LT-51368, Kaunas, Lithuania;Intelligent Systems Laboratory, Halmstad University, Box 823, S 301 18 Halmstad, Sweden and Department of Electrical & Control Equipment, Kaunas University of Technology Studentu 50, LT-51368, Kau ...;Department of Electrical & Control Equipment, Kaunas University of Technology Studentu 50, LT-51368, Kaunas, Lithuania;Department of Otolaryngology, Kaunas University of Medicine Eiveniu 2, LT-50009, Kaunas, Lithuania
Venue:
Expert Systems with Applications: An International Journal
Year:
2012

Citing 8
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Abstract

This paper is concerned with soft computing techniques-based noninvasive monitoring of human larynx using subject's questionnaire data. By applying random forests (RF), questionnaire data are categorized into a healthy class and several classes of disorders including: cancerous, noncancerous, diffuse, nodular, paralysis, and an overall pathological class. The most important questionnaire statements are determined using RF variable importance evaluations. To explore data represented by variables used by RF, the t-distributed stochastic neighbor embedding (t-SNE) and the multidimensional scaling (MDS) are applied to the RF data proximity matrix. When testing the developed tools on a set of data collected from 109 subjects, the 100% classification accuracy was obtained on unseen data in binary classification into the healthy and pathological classes. The accuracy of 80.7% was achieved when classifying the data into the healthy, cancerous, noncancerous classes. The t-SNE and MDS mapping techniques applied allow obtaining two-dimensional maps of data and facilitate data exploration aimed at identifying subjects belonging to a ''risk group''. It is expected that the developed tools will be of great help in preventive health care in laryngology.