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 ( “” ).
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Select Differences with a Control as the LSMeans Difference Set for Volcano Plots to enable this option.
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Enter the value of the treatment level in the text field. You must enclose this level in double quotation marks ( “” ).
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The default level is "Placebo" or "Pbo" if this is found (case insensitive). Otherwise, it is the last sorted level.