assessSD {affycomp} | R Documentation

## SD Assessment functions

### Description

Assessment function for standard deviation estimates. Takes a dilution data `ExpressionSet` and returns a list with necessary information to create assessment plot.

### Usage

    assessSD(exprset, method.name=NULL, logx=FALSE)

### Arguments

`exprset` | An `ExpressionSet` containing expression measures for Affymetrix's dilution experiment.
`method.name` | Name of expression measure being assessed.
`logx` | Logical indicating whether the average expression being computed should be logged, default no. See details.

### Details

`assessSD` does the assessment for Figure 7. This requires the `ExpressionSet` to have standard error estimates for the expression measure. Some expression measures (e.g. dChip) will have SEs in original scale, where others (e.g. RMA) will have them in log scale. For the former, use `logx=TRUE`.

### Value

Lists with the necessary information to make the Figures.

### Author(s)

Rafael A. Irizarry

[Package affycomp version 1.64.0 Index]