estimate_nearneighbor2: Near-Neighbor Information with Bias Correction

In Rdimtools: Dimension Reduction and Estimation Methods

Near-Neighbor Information with Bias Correction

Description

Though similar to est.nearneighbor1, authors of the reference argued that there exists innate bias in the method and proposed a non-iterative algorithm to reflect local distance information under a range of neighborhood sizes.

Usage

est.nearneighbor2(X, kmin = 2, kmax = max(3, round(ncol(X)/2)))

Arguments

X	an (n\times p) matrix or data frame whose rows are observations.
kmin	minimum neighborhood size, larger than 1.
kmax	maximum neighborhood size, smaller than p.

Value

a named list containing containing

estdim

estimated intrinsic dimension.

Author(s)

Kisung You

References

\insertRef

verveer_evaluation_1995Rdimtools

Examples

## create an example data with intrinsic dimension 2
X = cbind(aux.gensamples(dname="swiss"),aux.gensamples(dname="swiss"))

## acquire an estimate for intrinsic dimension
output = est.nearneighbor2(X)
sprintf("* est.nearneighbor2 : estimated dimension is %.2f.",output$estdim)

Rdimtools documentation built on Dec. 28, 2022, 1:44 a.m.