This paper examines properties and interrelations of several concepts of generalized concavity. It shows that the class of functions that are both 'generalized concave' and 'generalized convex' is ...

, Enno Mammen, Byeong U. Park, , On Estimation of Monotone and Concave Frontier Functions, Journal of the American Statistical Association, Vol. 94, No. 445 (Mar ...