There’s more to geo testing than matched markets
A common misconception is that matched market tests are the only way to do geo testing. Economists and statisticians have made enormous progress in geo testing so you don’t have to settle and can do regional experiments instead! Matched market tests, for example, are when you do something in Detroit and compare it to Milwaukee. Regional experiments, on the other hand, randomly sample a larger number of markets into control and treatment groups.
Matched market methods have limitations compared to regional experiments:
1. Less precision. With only 1-3 locations in the treated zone, the error on any matched market test analysis is going to be much higher than it would be for a broader test that can average out noise across many regions.
2. Less transferable insights. Different regions may respond differently to the same creatives and campaign configurations. As you isolate your treatment down to 1-3 locations for a matched market test you lose credibility that the estimated impacts for those areas will transfer to the rest of the country.
3. Downward bias on estimated ROI. Depending on how much you plan to spike your marketing for the matched markets, you may be flooding them with much more spend than you otherwise would have in a business as usual setting. If that's the case, you will be further down the diminishing marginal return curve than in business as usual, making your overall ROI look smaller.
The most accurate and precise regional experiments use frontier methods:
* At Haus, instead of taking the naive average of a few matched markets, we build synthetic control models that weigh control regions to best fit the targeted regions. For example, for your business, Seattle might be comparable to 60% San Francisco, 30% Denver, and 10% San Diego.
* And we don’t stop at traditional synthetic control, Haus has PhD scientists focused on continually improving the performance of the models we use.
This is why science matters.