What Donald Trump is doing on the campaign trail share Share View Photos View Photos Next Image MANCHESTER, NH - NOVEMBER 7: Republican presidential candidate Donald Trump speaks during a campaign event at SNHU Arena in Manchester, NH on Monday November 07, 2016. (Jabin Botsford/The Washington Post)

In the past, Foursquare and its sister app, Swarm, have figured out how certain businesses are performing by scouring their data on the foot traffic of more than 50 million users, which includes both “check-ins” at various businesses and location-based data for people who allow the app to access their location in the background. The company accurately predicted a big drop in Chipotle’s sales following a food poisoning scandal earlier this year, and successfully forecast how many iPhones Apple would sell after the launch of its 6S. Now it is using the same approach to examine Trump’s businesses.

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Foursquare found that, since Donald Trump announced that he was running for president in June 2015, foot traffic to Trump-branded hotels, casinos and golf courses has dropped. “Since spring, it’s fallen more,” the company says. The Trump Organization did not immediately respond to requests for comment.

The graph below shows that trend. The lines represent the “visit share” to Trump-branded properties, which is the number of visits Foursquare recorded to Trump hotels, golf courses and casinos taken as a percentage of the number of visits to other hotels, golf courses and casinos in the same geographic areas. (The company did this so that it can distinguish trends in Trump properties from trends that might be affecting the hospitality and entertainment industry more broadly.)

The blue line traces that visit share from April 2014 to July 2015; the pink line once again picks up at April 2015 and continues through July 2016. The grey bars show the year-over-year change in that share for the last 16 months.

As you can see, the pink line falls below the blue line in the spring of 2015, just as Trump announced his candidacy in June 2015. Trump’s businesses failed to see the gains in foot traffic that they typically do during the summer, Foursquare says. Things appear to get worse this spring, as voters in states around the country went to the primaries. Foot traffic at Trump properties was down 17 percent year-on-year in March, April and June, and down 14 percent year-on-year in July.

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The data obviously only represents people who use Foursquare and Swarm, which is a select group. The company says that it has normalized that data against figures from the U.S. census to remove age and gender bias, but that urban dwellers are still somewhat over-represented in their figures.

One likely reason for the fall in traffic, Foursquare says, is that Trump’s hotels, casinos and golf courses are mainly located in “blue states,” like New York, Hawaii, New Jersey and Illinois, and depend on local visitors from those regions. In blue states, Trump’s properties have seen foot traffic decrease by more than the national average, for example falling 20 percent year-on-year in July 2016. In “purple” swing states, the drop has been less extreme, as the second graph below shows.

Foursquare’s analysis also shows that this drop has been particularly driven by women, who tend to have more unfavorable opinions of Trump than men, polls show. Visits by women to Trump hotels, casinos and golf courses have fallen by nearly one-third this spring.

Since the traffic at Trump properties diverges so sharply with similar businesses, the trends may be evidence of people voting with their feet. But, as Foursquare points out, these changes may not have much of an impact on Donald Trump's wallet.

In many cases, these hotels, casinos and golf courses are not directly owned by Donald Trump but merely licensing his name.