 Another type of graph with a similar causal structure is an influence diagram , the vertices of which represent either decisions to be made or unknown information , and the edges of which represent causal influences from one vertex to another . In epidemiology , for instance , these diagrams are often used to estimate the expected value of different choices for intervention . 
 Another type of graph with a similar causal structure <a href='drop_aux' title='1'><mark>is</mark></a>an influence diagram , the vertices of which represent either decisions to be made or unknown information , and the edges of which represent causal influences from one vertex to another . In epidemiology , for instance , these diagrams are often used to estimate the expected value of different choices for intervention . 
Anotha type of graph w a similar causal structure an influence diagram , the vertices of which represent either decisions to b made or unknown information , and the edges of which represent causal influences from one vertex to another . In epidemiology , for instance , these diagrams are often used to estimate the expected value of different choices for intervention .