The Ratios and Differences tool in Phoenix is a data manipulation tool that is used to compare data from either one or two worksheets by computing ratios or differences. The computations are based on sort variables and on a variable that defines how data values are to be used as the X values and Y values of the ratios/differences. In Pharmacokinetics, ratios are often computed for observation data collected under two different scenarios and for resulting final parameters from two NCA or Modeling executions. For discrete final parameters or log-transformed observation data, differences may be applicable instead of ratios.
Use one of the following to add the object to a Workflow:
Right-click menu for a Workflow object: New > Computation Tools > Ratios and Differences.
Main menu: Insert > Computation Tools > Ratios and Differences.
Right-click menu for a worksheet: Send To > Computation Tools > Ratios and Differences.
To view the object in its own window, select it in the Object Browser and double-click it or press ENTER. All instructions for setting up and execution are the same whether the object is viewed in its own window or in Phoenix view.
Additional information is available on the following topics:
Worksheet 1 and 2 Mappings panel
See the “Analysis of three profiles using NCA” section for an example of using the Ratios and Differences object.
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