Truncated distributions for the standardized precipitation (SPI) and standardized streamflow (SSI) indices in a tropical basin
| dc.citation.journaltitle | HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES | |
| dc.creator | MARTINS, L. L. | |
| dc.creator | MARTINS, W. A. | |
| dc.creator | DE MORAES, J. F. L. | |
| dc.date.accessioned | 2026-05-05T17:56:53Z | |
| dc.date.issued | 2025 | |
| dc.description.resumo | This study evaluated whether truncated three-parameter distributions improve the selection of candidate distributions for the Standardized Precipitation Index (SPI) and Standardized Streamflow Index (SSI). We compared their performance with two-parameter distributions across time scales of 1 to 12 months in a tropical basin. Nine probability distributions were assessed using a multi-criteria approach based on the Lilliefors goodness-of-fit test, Akaike information criterion, Shapiro-Wilk normality test, and deviation from normality. Truncated distributions improved the comparison between two- and three-parameter distributions regarding their ability to generate normally distributed index estimates. The truncated Pearson-III and truncated generalized extreme value distributions emerged as the most suitable distributions for estimating the SPI and SSI, respectively, in a tropical basin. Considering that the Tweedie distribution ranked as the second-best distribution for calculating both indices, it emerged as an appropriate choice for using a single model to calculate both the SPI and SSI in such regions. | |
| dc.format.extent | 1-16 | |
| dc.format.issue | 1 | |
| dc.identifier.citation | Lopes Martins, L., Martins, W. A., de Moraes, J. F. L., & Blain, G. C. (2025). Truncated distributions for the Standardized Precipitation Index (SPI) and Standardized Streamflow Index (SSI) in a tropical basin. Hydrological Sciences Journal, 70(16), 3099–3114. https://doi.org/10.1080/02626667.2025.2576493 | |
| dc.identifier.doi | http://dx.doi.org/10.1080/02626667.2025.2576493 | |
| dc.identifier.uri | https://repositorio.iac.sp.gov.br/handle/iac/66 | |
| dc.subject | probability distribution, Tweedie, Pearson-III, GEV | |
| dc.title | Truncated distributions for the standardized precipitation (SPI) and standardized streamflow (SSI) indices in a tropical basin |