BASiCS_Chain {BASiCS} | R Documentation

## The BASiCS_Chain class

### Description

Container of an MCMC sample of the BASiCS' model parameters as generated by the function `BASiCS_MCMC`.

### Slots

`parameters`

  List of matrices containing MCMC chains for each model parameter. Depending on the mode in which BASiCS was run, the following parameters can appear in the list:

  `mu`

    MCMC chain for gene-specific mean expression parameters μ_i, biological genes only (matrix with `q.bio` columns, all elements must be positive numbers)

  delta

    MCMC chain for gene-specific biological over-dispersion parameters δ_i, biological genes only (matrix with `q.bio` columns, all elements must be positive numbers)

  phi

    MCMC chain for cell-specific mRNA content normalisation parameters φ_j (matrix with `n` columns, all elements must be positive numbers and the sum of its elements must be equal to `n`)

  This parameter is only used when spike-in genes are available.

  s

    MCMC chain for cell-specific technical normalisation parameters s_j (matrix with `n` columns, all elements must be positive numbers)

  nu

    MCMC chain for cell-specific random effects ν_j (matrix with `n` columns, all elements must be positive numbers)

  theta

    MCMC chain for technical over-dispersion parameter(s) θ (matrix, all elements must be positive, each colum represents 1 batch)

  `beta`

    Only relevant for regression BASiCS model (Eling et al, 2017). MCMC chain for regression coefficients (matrix with `k` columns, where `k` represent the number of chosen basis functions + 2)

  `sigma2`

    Only relevant for regression BASiCS model (Eling et al, 2017). MCMC chain for the residual variance (matrix with one column, sigma2 represents a global parameter)

  `epsilon`

    Only relevant for regression BASiCS model (Eling et al, 2017). MCMC chain for the gene-specific residual over-dispersion parameter (matrix with `q` columns)

  `RefFreq`

    Only relevant for no-spikes BASiCS model (Eling et al, 2017). For each biological gene, this vector displays the proportion of times for which each gene was used as a reference (within the MCMC algorithm), when using the stochastic reference choice described in (Eling et al, 2017). This information has been kept as it is useful for the developers of this library. However, we do not expect users to need it.

### Author(s)

Catalina A. Vallejos cnvallej@uc.cl

Nils Eling eling@ebi.ac.uk

### Examples

    # A BASiCS_Chain object created by the BASiCS_MCMC function.
    Data <- makeExampleBASiCS_Data()

    # To run the model without regression
    Chain <- BASiCS_MCMC(Data, N = 100, Thin = 2, Burn = 2, Regression = FALSE)

    # To run the model using the regression model
    ChainReg <- BASiCS_MCMC(Data, N = 100, Thin = 2, Burn = 2, Regression = TRUE)

[Package BASiCS version 2.2.4 Index]