• Ananthakrishnan R, Soman MK. 1989. Statistical distribution of daily rainfall and its association with the coefficient of variation of rainfall series. International Journal of Climatology 9: 485500.
  • Crutcher HL. 1975. A note on the possible misuse of the kolmogorov-smirnov test. Journal of Applied Meteorology 14: 16001603.
  • Food and Agriculture Organization. 2005a. The State of Food and Agriculture 2005. FAO: Rome.
  • Food and Agriculture Organization. 2005b. The State of Food Insecurity in the World 2005. FAO: Rome.
  • Funk C, Michaelsen J. 2004. A simplified diagnostic model of orographic rainfall for enhancing satellite-based rainfall estimates in data-poor regions. Journal of Applied Meteorology 43: 13661378.
  • Funk C, Michaelsen J, Verdin J, Artan G, Husak G, Senay G, Gadain H, Magadzire T. 2003. The collaborative historical African rainfall model: description and evaluation. International Journal of Climatology 23: 4766.
  • Hayes MJ, Svoboda MD, Wilhite DA, Vanyarkho OV. 1999. Monitoring the 1996 drought using the standardized precipitation index. Bulletin of the American Meteorological Society 80: 429438.
  • Ison NT, Feyerherm AM, Dean Bark L. 1971. Wet period precipitation and the gamma distribution. Journal of Applied Meteorology 10: 658665.
  • Juras J. 1994. Some common features of probability distributions for precipitation. Theoretical and Applied Climatology 49: 6976.
  • Kalnay E, Kanamitsu M, Kistler R, Collins W, Deaven D, Gandin L, Iredell M, Saha S, White G, Woollen J, Zhu Y, Leetmaa A, Reynolds B, Chelliah M, Ebisuzaki W, Higgins W, Janowiak J, Mo KC, Ropelewski C, Wang J, Jenne R, Joseph D. 1996. The NCEP/NCAR 40-year reanalysis project. Bulletin of the American Meteorological Society 77: 437471.
  • Legates DR. 1991. An evaluation of procedures to estimate monthly precipitation probabilities. Journal of Hydrology 122: 129140.
  • McKee TB, Doesken NJ, Kleist J. 1993. The relationship of drought frequency and duration to time scales. In 8th Conference on Applied Climatology, 179184.
  • Öztürk A. 1981. On the study of a probability distribution for precipitation totals. Journal of Applied Meteorology 20: 14991595.
  • Siegel S. 1956. Nonparametric Statistics for the Behavioral Sciences. McGraw-Hill: New York.
  • Thom HC. 1958. A note on the gamma distribution. Monthly Weather Review 86: 117122.
  • Wilks D. 1990. Maximum likelihood estimation for the gamma distribution using data containing zeros. Journal of Climate 3: 14951501.
  • Wilks DS. 1995. Statistical Methods in the Atmospheric Sciences: an Introduction. Academic Press: San Diego, CA.
  • Willmott CJ, Robeson SM. 1995. Climatologically aided interpolation (CAI) of terrestrial air temperature. International Journal of Climatology 15: 221229.
  • Woolhiser DA. 1992. Modeling daily precipitation—progress and problems. In Statistics in the Environmental & Earth Sciences, WaldenAT, GuttorpP. Halsted Press: London; 7189.
  • Wu H, Hayes MJ, Weiss A, Hu Q. 2001. An evaluation of the standardized precipitation index, the China-Z index and the statistical Z-Score. International Journal of Climatology 21: 745758.