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March 2014 Applying multiple testing procedures to detect change in East African vegetation
Nicolle Clements, Sanat K. Sarkar, Zhigen Zhao, Dong-Yun Kim
Ann. Appl. Stat. 8(1): 286-308 (March 2014). DOI: 10.1214/13-AOAS686


The study of vegetation fluctuations gives valuable information toward effective land use and development. We consider this problem for the East African region based on the Normalized Difference Vegetation Index (NDVI) series from satellite remote sensing data collected between 1982 and 2006 over 8-kilometer grid points. We detect areas with significant increasing or decreasing monotonic vegetation changes using a multiple testing procedure controlling the mixed directional false discovery rate (mdFDR). Specifically, we use a three-stage directional Benjamini–Hochberg (BH) procedure with proven mdFDR control under independence and a suitable adaptive version of it. The performance of these procedures is studied through simulations before applying them to the vegetation data. Our analysis shows increasing vegetation in the Northern hemisphere as well as coastal Tanzania and generally decreasing Southern hemisphere vegetation trends, which are consistent with historical evidence.


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Nicolle Clements. Sanat K. Sarkar. Zhigen Zhao. Dong-Yun Kim. "Applying multiple testing procedures to detect change in East African vegetation." Ann. Appl. Stat. 8 (1) 286 - 308, March 2014.


Published: March 2014
First available in Project Euclid: 8 April 2014

zbMATH: 06302236
MathSciNet: MR3191991
Digital Object Identifier: 10.1214/13-AOAS686

Keywords: directional false discovery rate , East Africa vegetation , False discovery rate , NDVI

Rights: Copyright © 2014 Institute of Mathematical Statistics


Vol.8 • No. 1 • March 2014
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