LOG PEARSON TYPE 3 DISTRIBUTION: A GENERALIZED EVALUATION

A generalized study of log Pearson type 3 distribution (LP) is performed in terms of the dimensionless variate which has a population mean of unity. The bounds of LP and different forms assumed by it are presented on the basis of the variance and skewness coefficient. It is seen that as LP deviates more and more from the two parameter lognormal distribution, its upper bound becomes small, the lower bound becomes large, and its from disintegrates to J, reverse J or U shape, some of which are hydrologically unreasonable. The K values for different return periods indicate that a bias in skew estimate does not affect the quantiles of LP in the same manner for all ranges and for all return periods. (ASCE)

• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Rao, D V
• Publication Date: 1980-5

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 853-872
• Serial:
  • Journal of the Hydraulics Division
  • Volume: 106
  • Issue Number: HY5
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Accuracy; Bias (Statistics); Coefficients; Estimates; Hydrology; Physical distribution; Skewed distributions; Skewed structures; Variance
• Uncontrolled Terms: Skewness
• Subject Areas: Freight Transportation; Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00314645
• Record Type: Publication
• Report/Paper Numbers: ASCE 15391
• Files: TRIS
• Created Date: Oct 8 1980 12:00AM