Use the text field to specify the control/reference level of the Treatment Arm . This level is used to construct differences with respect to all other levels. Enclose this level in double quotation marks ( “” ).
Select Differences with a Control as the LSMeans Difference Set for Volcano Plots to enable this option.
Enter the value of the treatment level in the text field. You must enclose this level in double quotation marks ( “” ).
The default level is "Placebo" or "Pbo" if this is found (case insensitive). Otherwise, it is the last sorted level.