jackstraw_pam: Non-Parametric Jackstraw for Partitioning Around Medoids...

In ncchung/jackstraw: Statistical Inference for Unsupervised Learning

Non-Parametric Jackstraw for Partitioning Around Medoids (PAM)

Description

Test the cluster membership for Partitioning Around Medoids (PAM)

Usage

jackstraw_pam(
  dat,
  pam.dat,
  s = NULL,
  B = NULL,
  center = TRUE,
  covariate = NULL,
  verbose = FALSE,
  pool = TRUE,
  ...
)

Arguments

dat	a matrix with m rows as variables and n columns as observations.
pam.dat	an output from applying cluster::pam() on dat.
s	a number of “synthetic” null variables. Out of m variables, s variables are independently permuted.
B	a number of resampling iterations.
center	a logical specifying to center the rows. By default, TRUE.
covariate	a model matrix of covariates with n observations. Must include an intercept in the first column.
verbose	a logical specifying to print the computational progress. By default, FALSE.
pool	a logical specifying to pool the null statistics across all clusters. By default, TRUE.
...	optional arguments to control the k-means clustering algorithm (refers to kmeans).

Details

PAM assigns m rows into K clusters. This function enable statistical evaluation if the cluster membership is correctly assigned. Each of m p-values refers to the statistical test of that row with regard to its assigned cluster. Its resampling strategy accounts for the over-fitting characteristics due to direct computation of clusters from the observed data and protects against an anti-conservative bias.

For a large dataset, PAM could be too slow. Consider using cluster::clara and jackstraw::jackstraw_clara.

The input data (dat) must be of a class matrix.

Value

jackstraw_pam returns a list consisting of

F.obs	m observed F statistics between variables and cluster medoids.
F.null	F null statistics between null variables and cluster medoids, from the jackstraw method.
p.F	m p-values of membership.

Author(s)

Neo Christopher Chung [e-mail]

References

Chung (2020) Statistical significance of cluster membership for unsupervised evaluation of cell identities. Bioinformatics, 36(10): 3107–3114 \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1093/bioinformatics/btaa087")}

Examples

## Not run: 
library(cluster)
dat = t(scale(t(Jurkat293T), center=TRUE, scale=FALSE))
pam.dat <- pam(dat, k=2)
jackstraw.out <- jackstraw_pam(dat, pam.dat = pam.dat)

## End(Not run)

ncchung/jackstraw documentation built on Dec. 22, 2024, 8:33 p.m.