iterchoiceS1: Number of iterations selection for iterative bias reduction...

In ibr: Iterative Bias Reduction

Number of iterations selection for iterative bias reduction model

Description

The function iterchoiceS1 searches the interval from mini to maxi for a minimum of the function which calculates the chosen criterion (critS1gcv, critS1aic, critS1bic, critS1aicc or critS1gmdl) with respect to its first argument (a given iteration k) using stats::optimize. This function is not intended to be used directly.

Usage

iterchoiceS1(n, mini, maxi, tUy, eigenvaluesS1, ddlmini, ddlmaxi,
y, criterion, fraction)

Arguments

n	The number of observations.
mini	The lower end point of the interval to be searched.
maxi	The upper end point of the interval to be searched.
eigenvaluesS1	Vector of the eigenvalues of the symmetric smoothing matrix S.
tUy	The transpose of the matrix of eigen vectors of the symmetric smoothing matrix S times the vector of observation y.
ddlmini	The number of eigen values of S equal to 1.
ddlmaxi	The maximum df. No criterion is calculated and Inf is returned.
y	The vector of observations of dependant variable.
criterion	The criteria available are GCV (default, "gcv"), AIC ("aic"), corrected AIC ("aicc"), BIC ("bic") or gMDL ("gmdl").
fraction	The subdivision of the interval [mini,maxi].

Details

The interval [mini,maxi] is splitted into subintervals using fraction. In each subinterval the function fcriterion is minimzed using stats::optimize (with respect to its first argument) and the minimum (and its argument) of the result of these optimizations is returned.

Value

A list with components iter and objective which give the (rounded) optimum number of iterations (between Kmin and Kmax) and the value of the function at that real point (not rounded).

Author(s)

Pierre-Andre Cornillon, Nicolas Hengartner and Eric Matzner-Lober

References

Cornillon, P.-A.; Hengartner, N.; Jegou, N. and Matzner-Lober, E. (2012) Iterative bias reduction: a comparative study. Statistics and Computing, 23, 777-791.

Cornillon, P.-A.; Hengartner, N. and Matzner-Lober, E. (2013) Recursive bias estimation for multivariate regression smoothers Recursive bias estimation for multivariate regression smoothers. ESAIM: Probability and Statistics, 18, 483-502.

Cornillon, P.-A.; Hengartner, N. and Matzner-Lober, E. (2017) Iterative Bias Reduction Multivariate Smoothing in R: The ibr Package. Journal of Statistical Software, 77, 1–26.

See Also

ibr, iterchoiceS1

ibr documentation built on Sept. 12, 2025, 10:19 a.m.