International Journal of Epidemiology 2001;30:515-520
© International Epidemiological Association 2001
Theory and Methods |
A case study of using artificial neural networks for classifying cause of death from verbal autopsy
b Centre for Measurement and Informatics in Medicine, City University, London, UK.
Daniel Chandramohan, Infectious and Tropical Diseases Department, London School of Hygiene & Tropical Medicine, Keppel Street, London WC1E 7HT, UK. E-mail: D.chandramohan{at}lshtm.ac.uk
Abstract
Background Artificial neural networks (ANN) are gaining prominence as a method of classification in a wide range of disciplines. In this study ANN is applied to data from a verbal autopsy study as a means of classifying cause of death.
Methods A simulated ANN was trained on a subset of verbal autopsy data, and the performance was tested on the remaining data. The performance of the ANN models were compared to two other classification methods (physician review and logistic regression) which have been tested on the same verbal autopsy data.
Results Artificial neural network models were as accurate as or better than the other techniques in estimating the cause-specific mortality fraction (CSMF). They estimated the CSMF within 10% of true value in 8 out of 16 causes of death. Their sensitivity and specificity compared favourably with that of data-derived algorithms based on logistic regression models.
Conclusions Cross-validation is crucial in preventing the over-fitting of the ANN models to the training data. Artificial neural network models are a potentially useful technique for classifying causes of death from verbal autopsies. Large training data sets are needed to improve the performance of data-derived algorithms, in particular ANN models.
KEY MESSAGES
- Artifical neural networks have potential for classifying causes of death from verbal autopsies.
- Large datasets are needed to train neural networks and for validating their performance.
- Generalizability of neural network models to various settings needs further evaluation.
Keywords Verbal autopsies, classification, neural networks
Accepted 10 January 2001
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