diffGraph: Graph Paired Differences

Description

Generic function to create a graph of differences from a data object created by the cg package.

Usage

diffGraph(data, ...)

Arguments

data

A data object created with a prepare function or method from the cg package. The only class of object currently valid is cgPairedDifferenceData, which is created by the prepareCGPairedDifferenceData function.

...

Additional arguments, depending on the specific method written for the object. Currently, there is only one such specific method; see diffGraph.cgPairedDifferenceData for any additional arguments that can be specified.

Value

The main purpose is the side effect of graphing to the current device. See the specific methods for discussion of any return values.

Details

Minimum and maximum values from ranges of data are respectively labeled in the bottom and top left corners of graph regions. Tick marks are attempted to be chosen wisely. For log-scaled axes in particular, leading digits of 2, 5, and 10 for values are included if possible. Since the algorithm is empirical, the ticklabels argument is available for further refinement or complete replacement of tickmarks.

Examples

Run this code

data(anorexia.FT)
anorexiaFT.data <- prepareCGPairedDifferenceData(anorexiaFT, format="groupcolumns",
                                                 analysisname="Anorexia FT",
                                                 endptname="Weight",
                                                 endptunits="lbs",
                                                 expunitname="Patient",
                                                 digits=1, logscale=TRUE)
diffGraph(anorexiaFT.data) 

# Graph the data on the original scale instead of the log scale.
diffGraph(anorexiaFT.data, logscale=FALSE)