Penggunaan gambar rajah nisbah LQ-momen dalam pemilihan taburan terbaik

Translated title of the contribution: Application of LQ-moment ratio diagram in selecting the best distribution

Ani Bin Shabri, Abdul Aziz Jemain

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The method of moments has been one of the simplest and conventional parameter estimation techniques used in statistical hydrology. However, moment estimates are usually inferior in quality and generally not as efficient as the L-moment estimates, especially for distribution with three or more parameters. Of late, many regional frequency studies in hydrology use the L-moment ratio diagram to select the most appropriate distribution of hydrologie and meteorological data. An advantage of L-moment ratio diagrams is that one can compare the fit of several distributions using a single graphical instrument. The purpose of this paper is to revisit the LQ moments and to develop the LQ-moments ratio diagrams based on median estimator. Using flood-flow data at 73 stations in Peninsular Malaysia, we explored the suitability of various flood frequency models using LQ-moments ratio diagrams compared with L-moments ratio diagrams. The result shows that the new diagrams perform as well as L-moments ratio diagrams for selecting a suitable frequency distributions and makes it an attractive option in flood frequency analysis.

Original languageUndefined/Unknown
Pages (from-to)647-653
Number of pages7
JournalSains Malaysiana
Volume39
Issue number4
Publication statusPublished - Aug 2010

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diagram
flood frequency
hydrology
frequency analysis
distribution

Keywords

  • L-moment ratio diagrams
  • L-moments
  • LQ-moments
  • Moments
  • Regional frequency

ASJC Scopus subject areas

  • General

Cite this

Penggunaan gambar rajah nisbah LQ-momen dalam pemilihan taburan terbaik. / Shabri, Ani Bin; Jemain, Abdul Aziz.

In: Sains Malaysiana, Vol. 39, No. 4, 08.2010, p. 647-653.

Research output: Contribution to journalArticle

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N2 - The method of moments has been one of the simplest and conventional parameter estimation techniques used in statistical hydrology. However, moment estimates are usually inferior in quality and generally not as efficient as the L-moment estimates, especially for distribution with three or more parameters. Of late, many regional frequency studies in hydrology use the L-moment ratio diagram to select the most appropriate distribution of hydrologie and meteorological data. An advantage of L-moment ratio diagrams is that one can compare the fit of several distributions using a single graphical instrument. The purpose of this paper is to revisit the LQ moments and to develop the LQ-moments ratio diagrams based on median estimator. Using flood-flow data at 73 stations in Peninsular Malaysia, we explored the suitability of various flood frequency models using LQ-moments ratio diagrams compared with L-moments ratio diagrams. The result shows that the new diagrams perform as well as L-moments ratio diagrams for selecting a suitable frequency distributions and makes it an attractive option in flood frequency analysis.

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