The earliest use of a random graph model was by Helen Hall Jennings and Jacob Moreno in 1938 where a "chance sociogram" (a directed Erdős-Rényi model) was considered in studying comparing the fraction of reciprocated links in their network data with the random model. Another use, under the name "random net", was by Solomonoff and Rapoport in 1951, using a model of directed graphs with fixed out-degree and randomly chosen attachments to other vertices. | The earliest use of a random graph model was by Helen Hall Jennings and Jacob Moreno in 1938 where a "chance sociogram" (a directed Erdős-Rényi model) was considered in studying comparing the fraction of reciprocated links in their network data with the random model. Another use, under the name "random net", was by Solomonoff and Rapoport in 1951, using a model of directed graphs with fixed out-degree and randomly chosen attachments to other vertices. |