Facebook (FB.O) said it would not disclose information about political campaign advertising or related data such as how many users click on ads and if advertising messages are consistent across demographics, despite arguments from political scientists who want the data for research.

Details such as the frequency of ads, how much money was spent on them, where they were seen, what the messages were and how many people were reached would remain confidential under the company’s corporate policy, which is the same for political advertising as for commercial customers.

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“The holy grail, I think, of political analysis for the 2016 election is to figure out which communications from which entities had an effect on which jurisdictions in the United States,” said Nathan Persily, a Stanford University professor who writes about elections.

Facebook has such information and should make it available for study, Persily said.