Target Analysis Report — Probability Table Analysis

Context

This analysis report is available for any Target Node.
It allows computing the impact on the Target State when slightly modifying one probability of a node’s Conditional Probability Table.
This is done for each cell of each relevant conditional probability table.

The sensitivity function used is:

$P(h \mid e)(t) = \frac{P(h,e)(t)}{P(e)(t)}$

where $h$ represents the hypothesis (Target Node = Target State), $e$ represents the context, and $t$ the probability.

The derivative of this function is computed, as well as the minimum and maximum values when setting the probability to 0% and 100%.

This HTML report has several sections:

Provides a description of the observed variables when the analysis is carried out.

For each sensitive node, a table represents each combination of its values and its parents’ values. Each cell contains two parts:
- The part on the left indicates the derivative computed for each combination of states. The background of the maximal derivative is yellow.
- The part on the right shows the probabilities of the target state when the probability of a current node’s state is set to 0% and to 100%. These probabilities are symmetric for binary nodes.