In DynRisk the uncertainty specifications are separated into two factors: a scaling factor, referred to as the 窶徑ocal factor窶 and a relative uncertainty distribution. The actual value of the node, i.e., the value it gets during a Monte Carlo simulation, is obtained by multiplying the local factor with a value generated from the relative uncertainty distribution.
To specify the relative uncertainty, you first choose a distribution type by using the 窶廛istrib.窶 popup menu in the 窶廢dit node窶 dialog box. The following distributions are available:
窶｢ Binary
窶｢ Binex
窶｢ Cens. normal
窶｢ Exponential
窶｢ Lognormal
窶｢ Normal
窶｢ Triangular
窶｢ Triangular 2
窶｢ Trc. normal
窶｢ Uniform
You then complete the uncertainty specifications by entering three parameter values in the 窶彗)窶, 窶彙)窶 and c)窶 fields.
Sometimes DynRisk needs to adjust the parameters to fit the chosen distribution. This is done automatically every time you run a simulation. If you open a node after a simulation is finished, however, you will still see the same numbers in the parameter fields as you entered. To see the adjusted values, you can click the 窶廡it窶 button. To return to your specifications again, click the 窶廡it窶 button once more while pressing the 窶彜hift窶 key on the keyboard.
In the following we describe each of the distributions in detail.
