A new study reopens a debate over whether Google’s search results lean liberal, a bias that could influence public opinion.

An analysis by online-search marketer CanIRank.com found that 50 recent searches for political terms on Google surfaced more liberal-leaning webpages than conservative ones, as rated by a panel of four people.

Alphabet Inc.’s Google denies allegations of bias. “From the beginning, our approach to search has been to provide the most relevant answers and results to our users, and it would undermine people’s trust in our results, and our company, if we were to change course,” a Google spokeswoman said in an email.

The company says its search results are “determined by algorithms using hundreds of factors” and “reflect the content and information that is available on the internet.”

The CanIRank analysis has weaknesses, most notably its reliance on four people’s judgments. Moreover, the findings are somewhat mixed: The searches surfaced more pages rated as “liberal” than “conservative” on a 5-point scale, but more pages were rated “very conservative” than “very liberal.”