Speaking at a parliamentary committee hearing, Davis said the last available analysis dated back to the 2016 referendum campaign.
"It (the government) made an estimate during the ... referendum campaign but I think one of the issues that's arisen is that those forecasts don't appear to have been very robust," said Davis, who became a minister in July after the referendum result.
Pressed whether any work had been done since then, he said: "If you mean under my time, no."
Davis said one reason for this was because preparing such an assessment was difficult given the current uncertainty and the number of variables involved.
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