The GeoLift by Recast tool can also be used to test an existing design and simulate the power curve for that design. Testing existing designs might be useful for a variety of reasons:
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You designed the test with another tool and want to check that GeoLift by Recast agrees that it’s a good design
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You designed the test awhile ago and want to test the same design with the latest data
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You needed to tweak a design to conform to real world constraints and want to check that it’s still satisfactory
To do this, go through the same steps as designing an experiment, however in the “Approximate $ for test” box put the actual planned spend change.
In the “Markets Required for Test Arm” box, enter all the locations of your previous design:
Then, using the “number of test geos” slider, set both the high end and the low end to the number of markets you input in the previous step.
Click “Generate Test Markets” to run the analysis just for this design. This will produce a spend recommendation that you can compare to the previous design.