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Table 2 Description of the five models

From: Developing drought stress index for monitoring Pinus densiflora diebacks in Korea

Model no. Description
Model 1 (M1) DSI = 0.5 × HI6 − 0.5 × SPI6
Model 2 (M2) DSI = 0.7 × HI6 − 0.3 × SPI6
Model 3 (M3) DSI = 0.5 × (0.5 × HI6 − 0.5 × SPI6) + 0.5 × (0.5 × HI48 − 0.5 × SPI48)
Model 4 (M4) DSI = 0.5 × (0.7 × HI6 − 0.3 × SPI6) + 0.5 × (0.7 × HI48 − 0.3 × SPI48)
Model 5 (M5) DSI = 0.7 × (0.7 × HI6 − 0.3 × SPI6) + 0.3 × (0.7 × HI48 − 0.3 × SPI48)