Penn National Gaming scored best among three slot parlor applicants in the state gaming commission’s mitigation category, which measures public support for the proposal and the developer’s plans to reduce possible negative effects of the project.

Rival proposals from Cordish Cos. and Raynham Park finished just behind Penn in the category, according to documents the Massachusetts Gaming Commission released this morning.

In the economic development category, Penn and Cordish earned the same ranking, just ahead of Raynham.

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The gaming commission is in its second day of review and deliberations before the award of its first license, for a slot parlor.

The state’s expanded gambling law, passed in 2011, authorized as many as three resort-style casinos and one slot parlor permitted to have 1,250 slot machines. Each of the slot applicants would also offer restaurants and other amenities.

A commission market study suggested each of the proposed slot facilities would generate annual gambling revenue of at least $128 million to $133 million, after the resort casinos open in Massachusetts. Total gambling revenue from four facilities would total about $1.7 billion a year, regardless of which applicant wins the slot license, according to the forecast.

By Friday, the commission will choose a winner among Penn, which proposes a slot parlor in Plainville; Cordish, which wants to build in Leominster; and Raynham Park, the former dog track in Raynham.

The slots license will cost $25 million; the slot parlor will pay a 49 percent state tax on gambling revenue.

On Tuesday, the Penn National proposal grabbed a nominal advantage, the Globe reported today.