the  value is between 0 and 1 but closer to 1. as can be inferred from the above formula, if the alpha factor is not taken into account, the calculated volume is an underestimate. in 1975, the cheese factory closed. lightning flashed in the sky and thunder clapped over his head. he got ill and died soon afterwards. over the course of a more than fifty year artistic career he created in excess of 225 sculptures. further, social groups do not have as stable memberships, since members are able to leave their social group and join new groups. 