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What is difference between CZI (China-Z Index) and MCZI (Modified CZI)?

The National Climate Center of China developed the CZI in 1995 as an alternative to the SPI (Ju et al., 1997) when mean precipitation follows the Pearson type III distribution. Further details can be found in Wu et al. (2001). Furthermore, the MCZI can also be calculated using the formula above but substituting the median precipitation for mean precipitation.

Ref: Ju XS, Yang XW, Chen LJ, Wang YM. 1997. Research on determination of indices and division of regional flood/drought grades in China (in Chinese). Quarterly Journal of Applied Meteorology 8(1): 26-33.

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