A DynRisk model consists of two kinds of objects: 窶從odes窶 and 窶彳dges窶. The nodes represent the variables in the model, while the edges represent dependencies between these variables. The graphical structure obtained when the nodes and edges are linked together, is called an 窶彿nfluence diagram窶.
We will start by creating the 窶徃oal node窶 of the model: the 窶彝evenue窶 node. In DynRisk there are five different menu items you can use to create new nodes. All items are located in a hierarchical menu found under 窶廸ew node窶 in the 窶廴odel窶 menu. These items correspond to five different node types: 窶廬ndependent窶, 窶彜um窶, 窶弃roduct窶, 窶廴aximum窶 and 窶廴inimum窶. You will learn more about these later. For now, just think of the node type as a description of what the node does with input from other nodes. Thus, e.g., a sum node adds up all its input, an independent node ignores input etc.
Since we want the 窶彝evenue窶 node to add up things, you select 窶廸ew node->Sum窶 from the 窶廴odel窶 menu. Alternatively, you can click the 窶彜um窶 button in the toolbar.
As a result you should get a new object in the window.
[When it is created, it is automatically hilited, indicating that it is 窶徭elected窶. Click somewhere else in the window to deselect it.]
