xpose4 (version 4.5.0)

add.functions: Column-transformation functions for Xpose 4

Description

These functions transform existing Xpose 4 data columns, adding new columns.

Usage

add.absval(object, 
           listall = TRUE, 
           classic = FALSE) 
add.dichot(object, 
           listall = TRUE, 
           classic = FALSE)
        
add.exp(object, 
        listall = TRUE, 
        classic = FALSE)
        
add.log(object, 
        listall = TRUE, 
        classic = FALSE)    
        
add.tad(object,  
        classic = FALSE)

Arguments

object

An xpose.data object.

listall

A logical operator specifying whether the items in the database should be listed.

classic

A logical operator specifying whether the function should assume the classic menu system. This is an internal option and need never be called from the command line.

Value

• An xpose.data object (classic == FALSE) or null (classic == TRUE).

Details

These functions may be used to create new data columns within the Xpose data object by transforming existing ones. add.absval creates a column reflecting the absolute value of a column, add.dichot creates a categorical data column based upon a continuous variable, add.exp creates an exponentiated version of an existing variable, add.log provides log transformation, and add.tad creates a time-after-dose (TAD) data item based upon the dose and time variables in the dataset.

See Also

xpose.data

Examples

## xpdb5 is an Xpose data object
## We expect to find the required NONMEM run and table files for run
## 5 in the current working directory
xpdb5 <- xpose.data(5)

## Create a column containing the absolute values of data in another 
## column
add.absval(xpdb5)

## Create a categorical data column based on a continuous data column, 
## and do not list variables 
add.dichot(xpdb5, listall = FALSE)

## Create a column containing the exponentiated values of data in 
## another column
add.exp(xpdb5)

## Create a column containing log-transformations of data in another 
## column
add.log(xpdb5)

## Create a time-after-dose column
add.tad(xpdb5)