Bootstrap Confidence Values

Description

Compute the bootstrap confidence values (in percent) for the inner edges and display the splits occurring in > 10 percent of the bootstrap data sets (the splits are characterized by one of the two subsets of leaves).

Usage

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  boot.conf.values(data, random.seed = 12345, nrep = 500)

Arguments

data

a binary matrix with rows representing tumors and columns representing genetic alterations.

random.seed

a single value, interpreted as an integer (containing the random number generator (RNG) state for random number generation in R).

nrep

number of replications.

Details

We use the nonparametric bootstrap (Felsenstein, 1985) to assess the uncertainty of properties of the estimated tree model. The proposed tree structure has to be interpreted with caution. Nevertheless we think that the model can at least serve an exploratory purpose, allowing us to formulate hypotheses about the evolution of karyotypes in the data set.

Value

frequencies

the splits occurring in more than 10 percent of the bootstrap data sets.

confidence values

bootstrap confidence values (in percent) for the inner edges.

References

von Heydebreck A, Gunawan B, Fuezesi L. 2004. Maximum likelihood estimation of oncogenetic tree models. Biostatistics 5:545-556. Felsenstein, J. 1985. Confidence limits on phylogenies: an approach using the bootstrap. Evolution 39:783-791.

Examples

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  ## NOT RUN
  ## The calculation of bootstrap confidence values needs longer run time.
  #data(kidney)
  #boot.conf.values(kidney$x, nrep=2)
  ## END(NOT RUN)