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Table 4 Summary of the statistics, POD, FAR and HSS, used in this study. They are computed from counts (letters ad) in a 2 × 2 contingency table (N = 1078 in TI case, N = 1148 in NM case). a SPD rainfall > threshold, VnGP rainfall > threshold; b SPD rainfall > threshold, VnGP rainfall ≤ threshold; c SPD rainfall ≤ threshold, VnGP rainfall > threshold; and d SPD rainfall ≤ threshold, VnGP rainfall ≤ threshold

From: Evaluation of satellite precipitation products over Central Vietnam

Name Formula Perfect score Worst score
POD a/(a + c) 1 0
FAR b/(a + b) 0 1
HSS 2(ad − bc)/((a + c)(c + d) + (a + b)(b + d)) 1 − ∞