Prism displays the treatment:control ratios (as percentages) on a Results sheet: In the Parameters dialog, tell Prism which column(s) contain the baseline data (columns A and C in this example) and that you want to "divide by baseline values to calculate.percentages". You make measurements before and after both interventions and tabulate your data as shown here:Ĭlick "Analyze", then choose the "Remove baseline" analysis.
Suppose you're studying effects of placebo and a test drug on mean blood pressures in 6 subjects. The reference data set can come either before or after the treatment set. If you make a separate control measurement for each experimental subject or treatment (or you have any other situation where individual reference measurements are matched to each "treatment" Y value or group of Y replicates), you can enter those control values in columns adjacent to your "treatment" values, in alternating fashion. If you're using Prism 4, consult the section entitled "Normalizing the Y Values" in this step-by-step example.
Prism's "Data manipulations" options allow you to do this automatically.
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