This tool allows you to graphically view the impact of changes in the selected nodes' means on the target node's mean. This lets you see the relationship between each node and the target variable in the form of curves. The translucent nodes are not taken into account.
For each node, its mean will vary from the minimum to the maximum of the variation domain and determ- ine, for each variation, the corresponding probability distribution up to MinXEnt method, in the same manner as for . Each node will be observed with this probability distribution and the corresponding value of the target node is calculated.
For each node the mean is computed from the values associated with the node: if the node has values associated with its states, the mean is computed from them, otherwise if the node is continuous, its mean is computed from the intervals, and if the node is discrete with integer or real states, the mean is computed from them. If there is no possibility to compute the mean, a default set of values from 0 to the number of states minus one is used.
A dialog box lets you configure the display of curves:
For the target variable, it is possible to display either the actual target's mean or the delta of the mean with the prior target's mean.
Likewise for other variables, it is possible to display either the actual mean or the delta of the mean with the prior mean. However, it is also possible to display the real variables' means, but all standardized between 0 and 100.
The option Use Hard Evidences replace the previously used algorithm to compute the points of each curve simply by observing each node states and by determining the node's mean and the corresponding target's mean.
The option Order by Strength sorts the variables from the slope the more towards 90 degrees to the slope the more towards -90 degrees. This sort variables that have the most positive impact on the target's mean to the most negative impact. This slope is calculated at the midpoint of the curve. By default, the nodes are sorted according to the order of the corresponding monitors, if they exist.
This figure represents the result of the previous settings. The legends are sorted according to the slope of the curves.
When the mouse hovers on any of the points on the curves, a tooltip displays the name of the variable represented by the curve. The coordinates are displayed at the top of the window. The evidence context, if it exists, is also displayed at the top of the window.
The following figure represents the display of the deltas. A zoom has been done on the central points. The zoom is operated as in the . It is also possible to change the curve's color by clicking on the colored square to the left of the node names in the legend.
The chart's contextual menu allows the user to:
- Display Comment instead of Name
- Copy the image of the chart or the curves' points as text or html
- Print the image of the chart