Some remarks about the gasser-sroka-jennen-steinnietz variance estimator

N. S. Altman, C. P. Paulson

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


This article proposes some simplifications of the residual variance estimator of Gasser, Sroka, and jennen-Steinmetz (GSJ, 1986) which is often used in conjunction with nonparametric regression. The GSJ estimator is a quadratic form of the data, which depends on the relative spacings of the design points. When the errors are independent, identically distributed Gaussian variables, and the true regression curve is flat, theestimate is distributed as a weighted sum of x2 variables. By matching the first two moments, the distribution can be approximated by a x2with degrees of freedom determined by the coefficients of the quadratic for. Computation ofthe estimated degrees of freedom requires computing the trace of the square of an n x n matrix, where n is the number of design points. In this article, (n-2)/3 is shown to be a conservative estimate of the approximate degrees of freedom, and (n-2)/2 is shown to be conservative for many designs. In addition, a simplified version of the estimator is shown to be asymptotically equivalent, under many conditions.

Original languageEnglish (US)
Pages (from-to)1045-1051
Number of pages7
JournalCommunications in Statistics - Theory and Methods
Issue number4
StatePublished - Jan 1 1993

All Science Journal Classification (ASJC) codes

  • Statistics and Probability


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