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Speaking Stata: The protean quantile plot

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  • Nicholas J. Cox

    (University of Durham, UK)

Abstract

Quantile plots showing by default ordered values versus cumulative probabilities are both well known and also often neglected, considering their ma jor advantages. Their flexibility and power is emphasized by using the qplot program to show several variants on the standard form, making full use of options for reverse, ranked, and transformed scales and for superimposing and juxtaposing quantile traces. Examples are drawn from the analysis of species abundance data in ecology. A revised version of qplot is formally released with this column. Distribution plots in which the axes are interchanged are also discussed briefly, in conjunction with a revised version of distplot, also released now.

Suggested Citation

  • Nicholas J. Cox, 2005. "Speaking Stata: The protean quantile plot," Stata Journal, StataCorp LP, vol. 5(3), pages 442-460, September.
    • Handle: RePEc:tsj:stataj:v:5:y:2005:i:3:p:442-460
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    References listed on IDEAS

    as
    1. Nicholas J. Cox, 2002. "Speaking Stata: How to move step by: step," Stata Journal, StataCorp LP, vol. 2(1), pages 86-102, February.
    2. Nicholas J. Cox, 2001. "Quantile plots, generalized: update to Stata 7.0," Stata Technical Bulletin, StataCorp LP, vol. 10(61).
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    Cited by:

    1. Nicholas J. Cox, 2010. "Speaking Stata: The limits of sample skewness and kurtosis," Stata Journal, StataCorp LP, vol. 10(3), pages 482-495, September.
    2. Nicholas J. Cox, 2010. "Speaking Stata: Graphing subsets," Stata Journal, StataCorp LP, vol. 10(4), pages 670-681, December.

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