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Identification of outlying height and weight data in the Iranian National Health Survey 1990-92

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  • M. Hosseini
  • R. G. Carpenter
  • K. Mohammad

Abstract

Data on the weights and heights of children 2-18 yeas old in Iran were obtained in a National Health Survey of 10 660 families in 1990-92. Data were 'cleaned' in 1 year age groups. After excluding gross outliers by inspection of bivariate scatter plots, Box-Cox power transformations were used to normalize the distributions of height and weight. If a multivariate Box-Cox power transformation to normality exists, then it is equivalent to normalizing the data variable by variable. After excluding gross outliers, exclusions based on the Mahalanobis distance were almost identical to those identified by Hadi's iterative procedure, because the percentages of outliers were small. In all, 1% of the observations were gross outliers and a further 0.4% were identified by multivariate analysis. Review of records showed that the outliers identified by multivariate analysis resulted from data-processing errors. After transformation and 'cleaning', the data quality was excellent and suitable for the construction of growth charts.

Suggested Citation

  • M. Hosseini & R. G. Carpenter & K. Mohammad, 1998. "Identification of outlying height and weight data in the Iranian National Health Survey 1990-92," Journal of Applied Statistics, Taylor & Francis Journals, vol. 25(5), pages 601-612, June.
    • Handle: RePEc:taf:japsta:v:25:y:1998:i:5:p:601-612
    DOI: 10.1080/02664769822855
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    References listed on IDEAS

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    1. Patrick ROyston, 1992. "Maximum-likelihood estimation for Box-Cox power transformation," Stata Technical Bulletin, StataCorp LP, vol. 1(5).
    2. William Gould & Ali S. Hadi, 1993. "Identifying multivariate outliers," Stata Technical Bulletin, StataCorp LP, vol. 2(11).
    3. N. A. Campbell, 1980. "Robust Procedures in Multivariate Analysis I: Robust Covariance Estimation," Journal of the Royal Statistical Society Series C, Royal Statistical Society, vol. 29(3), pages 231-237, November.
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