The DOI matches its Crossref record; 13 of the 13 references it cites were found in a registry or an index.
ACCEPTING THE STANDARDIZED PRECIPITATION INDEX: A CALCULATION ALGORITHM1
Abstract
ABSTRACT: The Palmer Drought Severity Index (PDSI) has been calculated for about 30 years as a means of providing a single measure of meteorological drought severity. It was intended to retrospectively look at wet and dry conditions using water balance techniques. The Standardized Precipitation Index (SPI) is a probability index that was developed to give a better representation of abnormal wetness and dryness than the Palmer indices. Before the user community will accept the SPI as an alternative to the Palmer indices, a standard method must be developed for computing the index. Standardization is necessary so that all users of the index will have a common basis for both spatial and temporal comparison of index values. If different probability distributions and models are used to describe an observed series of precipitation, then different SPI values may be obtained. This article describes the effect on the SPI values computed from different probability models as well as the effects on dry event characteristics. It is concluded that the Pearson Type III distribution is the “best” universal model, and that the reliability of the SPI is sample size dependent. It is also concluded that because of data limitations, SPIs with time scales longer than 24 months may be unreliable. An internet link is provided that will allow users to access Fortran 77 source code for calculating the SPI.
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cites
(1993) · Cited by 7,699
Regional Frequency Analysis: An Approach Based on L-Moments
Hosking, J. R. M., & Wallis, J. R. (1997) · Cambridge University Press eBooks · doi:10.1017/cbo9780511529443 · Cited by 2,622
(2012) · Water Drops · doi:10.2307/jj.18376987.67 · Cited by 1,662
The Palmer Drought Severity Index: Limitations and Assumptions
Alley, W. M. (1984) · Journal of Climate and Applied Meteorology · doi:10.1175/1520-0450(1984)023<1100:tpdsil>2.0.co;2 · Cited by 1,372
COMPARING THE PALMER DROUGHT INDEX AND THE STANDARDIZED PRECIPITATION INDEX1
Guttman, N. B. (1998) · JAWRA Journal of the American Water Resources Association · doi:10.1111/j.1752-1688.1998.tb05964.x · Cited by 1,140
Self-citationDROUGHT MONITORING WITH MULTIPLE TIME SCALES
McKee, T. B., Doesken, N. J., & Kleist, J. (1995) · Medical Entomology and Zoology · Cited by 1,065
Karl, T. R. (1986) · Journal of Climate and Applied Meteorology · doi:10.1175/1520-0450(1986)025<0077:tsotpd>2.0.co;2 · Cited by 395
(1997) · Regional Frequency Analysis · doi:10.1017/cbo9780511529443.003 · Cited by 325
Some Spatial Characteristics of Drought Duration in the United States
Karl, T. R. (1983) · Journal of Climate and Applied Meteorology · doi:10.1175/1520-0450(1983)022<1356:sscodd>2.0.co;2 · Cited by 213
SPATIAL COMPARABILITY OF THE PALMER DROUGHT SEVERITY INDEX1
Guttman, N. B., Wallis, J. R., & Hosking, J. R. M. (1992) · JAWRA Journal of the American Water Resources Association · doi:10.1111/j.1752-1688.1992.tb04022.x · Cited by 160
Self-citation
Cited by
Deep learning and process understanding for data-driven Earth system science
Reichstein, M., Camps-Valls, G., Stevens, B., Jung, M., Denzler, J., Carvalhais, N., & Prabhat (2019) · Nature · doi:10.1038/s41586-019-0912-1 · Cited by 5,673
Beguería, S., Vicente-Serrano, S. M., Reig, F., & Latorre, B. (2014) · International Journal of Climatology · doi:10.1002/joc.3887 · Cited by 2,128
Spinoni, J., Naumann, G., Carrao, H., Barbosa, P., & Vogt, J. (2014) · International Journal of Climatology · doi:10.1002/joc.3875 · Cited by 803
Recent drought and precipitation tendencies in Ethiopia
Viste, E., Korecha, D., & Sorteberg, A. (2013) · Theoretical and Applied Climatology · doi:10.1007/s00704-012-0746-3 · Cited by 462
A new global database of meteorological drought events from 1951 to 2016
Spinoni, J., Barbosa, P., De Jager, A., McCormick, N., Naumann, G., Vogt, J. V., Magni, D., Masante, D., & Mazzeschi, M. (2019) · Journal of Hydrology: Regional Studies · doi:10.1016/j.ejrh.2019.100593 · Cited by 452
Metadata
- Authors
- Guttman, N. B.
- Venue
- JAWRA Journal of the American Water Resources Association
- Publisher
- Wiley
- Published
- 1999-04
- Volume
- 35
- Issue
- 2
- Pages
- 311-322
- ISSN
- 1093-474X (ISSN-L)
- 1752-1688
- OpenAlex
- W2108564811
- Cited by
- 1,450
- References
- 13
- FWCI
- 3.00
- Type
- journal article
- Language
- en
- Open access
- closed
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
How to cite
Cite CoChat for the checks on this page, and the paper for its own findings.
- This page
- CoChat. (2026). Citation check: ACCEPTING THE STANDARDIZED PRECIPITATION INDEX: A CALCULATION ALGORITHM1. https://app.cochat.ai/papers/10.1111/j.1752-1688.1999.tb03592.x
- The paper
- Guttman, N. B. (1999). ACCEPTING THE STANDARDIZED PRECIPITATION INDEX: A CALCULATION ALGORITHM1. JAWRA Journal of the American Water Resources Association. https://doi.org/10.1111/j.1752-1688.1999.tb03592.x
Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.