Apr 29, 2020

Functional data analysis techniques to improve the generalizability of near-infrared spectral data for monitoring mosquito populations

BioRxiv : the Preprint Server for Biology
P. M. EsperancaThomas S Churcher

Abstract

Near infrared spectroscopy is increasingly being used as an economical method to monitor mosquito vector populations in support of disease control. Despite this rise in popularity, strong geographical variation in spectra has proven an issue for generalising predictions from one location to another. Here, we use a functional data analysis approach---which models spectra as smooth curves rather than as a discrete set of points---to develop a method that is robust to geographic heterogeneity. Specifically, we use a penalised generalised linear modelling framework which includes efficient functional representation of spectra, spectral smoothing and regularisation. To ensure better generalisation of model predictions from one training set to another, we use cross-validation procedures favouring smoother representation of spectra. To illustrate the performance of our approach, we collected spectra for field-caught specimens of Anopheles gambiae complex mosquitoes -- the most epidemiologically important vector species on the planet -- in two sites in Burkina Faso. Using these spectra, we show how models trained on data from one site can successfully classify morphologically identical sibling species in another site, over 250km away. ...Continue Reading

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