anchor: There is considerable uncertainty as to whether the 26 studies on the value of a statistical life provide adequate estimates of the value of a statistical life saved by air pollution reduction.
positive: 26 studies concern the value of a statistical life and its estimates of that value saved by air pollution reduction.
negative: There is no uncertainty as to whether the 26 studies on the value of a statistical life provide adequate estimates of the value of a statistical life saved by air pollution reduction.