datasource.subsample: Subsampling datasource procedure
In netbenchmark: Benchmarking of several gene network inference methods

Description Usage Arguments Details Value See Also Examples

datasource.subsample picks randomly the specified amount of samples from the original datasource and also adds noise to the subsampled dataset if it is specified.

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    datasource.subsample(datasource,experiments=NA,datasets.num=5,
        local.noise=20,global.noise=0,noiseType="normal",
        samplevar=TRUE)

`datasource`	data.frame where columns contain variables and rows contain experiments.
`experiments`	Integer specifying the number of experiments that for performing the subsampling of datasources (default: NA).
`datasets.num`	Integer specifying the number of datasets to be generated for each of the selected original datasources (default: 5).
`local.noise`	Integer specifying the desired percentage of local noise to be added at each of the subsampled datasets (default: 20).
`global.noise`	Integer specifying the desired percentage of global noise to be added at each of the subsampled datasets (default: 0).
`noiseType`	Character specifying the type of the noise to be added: "normal" (default: "normal").
`samplevar`	(default: TRUE).

If the argument experiments is NA, the value experiments will be calculated automatically in order to have datasets.num smaller datasets that does not have the same experiment twice inside each dataset. Each of the subsampled datasets experiments would have a number of experiments around experiments \pm 20 \% that would be chosen randomly among the original the original number of experiments without replacement.

If the argument experiments is a number, the number of datasets.num is calculated automatically. If the number of specified experiments is greater or equal than the original number of experiments, then only a replicate will be generated and the subsampled dataset would have the same dimensions as the original one but the experiments will be unsorted randomly.

Two different types of noises could be added, that are specified with the argument noiseType:

"local": the variance of the noise is different for each variable and it is the percentage specified of the variance of each variable ( \pm 20 \% ).
"Globlal": the variance of the noise is the same for the whole datasource, it is the percentage specified of the mean variance of all the variables ( \pm 20 \% ).

datasource.subsample returns a list with datasets.num elements, each one of objects contains a data.frame of the subsampled dataset with the amount of Gaussian noise specified that would contain the same number of variables.

netbenchmark

    # Subsample
    data.list.1 <- datasource.subsample(syntren300.data)
    data.list.2 <- datasource.subsample(syntren300.data,
        local.noise=10)
    # Inference
    inf.net.1 <- cor(data.list.1[[1]])
    inf.net.2 <- cor(data.list.2[[4]])