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The UW report excludes multi-site businesses from its dataset, which removes 48 percent of Seattle’s low-paid workforce out of their study. This major exclusion raises a big red caution flag about the representativeness of their sample and therefore about the interpretation of their findings.

The Berkeley study looked only at one industry. Not sure they're in any place to be criticizing "major exclusions."

I'm not qualified to review either paper, but it's worth noting the UW paper was commissioned by the city government to gauge the effect of their own law.

The Berkeley study was written by someone who founded an advocacy group to "support an American version of socialism, with public ownership of production and a government-planned economy to meet social needs rather than the needs of private profit."