Precipitation Concentration Index
Index to evaluate precipitation heterogeneity at a monthly scale. Values <10 (uniform monthly rainfall distribution); values 11-15 (moderate concentration of precipitation); values 16-20 (irregular distribution); and >20 ((high precipitation concentration)
pci(data, data_names = NULL, na.rm = FALSE, ...)
data |
daily precipitation, mm |
data_names |
names of each period of time |
na.rm |
logical. Should missing values (including NaN) be removed? |
... |
further arguments passed to or from other methods |
index value
PCI = \frac{∑_{i=1}^{12} P_i ^ 2} {(P_t) ^ 2} * 100
Oliver, J.E. (1980) Monthly precipitation distribution: a comparative index. Professional Geographer, 32, 300–309
data(data_all) pci(data = data_all$rr)
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