SANN - Results - Graphs Tab

Neural Networks

Select the Graphs tab of the SANN - Results dialog box to access the options described here. For information on the options that are common to all tabs, see SANN - Results. Note that for all graph types, you can include cases in the Train, Test, and/or Validation subsets by selecting the appropriate check boxes in the Samples group box. For example, to view a histogram of the outputs for the Validation subset, select Output in the X-axis box, select the Validation check box in the Samples group, and click the Histograms of X button. Only the predictions for cases in the validation sample will be plotted.

Case names (2-D and 3-D). Select this check box to include the case names as point labels on 2D and 3D graphs. When case names are not used in the data set, case numbers will be displayed.

X-axis/Y-axis/Z-axis. Use the X-axis, Y-axis, and Z-axis list boxes to select either the activations or an input variable to plot on the respective axis. The variables lists contain both input variables and network activations. Select either of them to plot the corresponding 1/2/3D relationships; note that the plot will be generated for the subset of cases specified in Samples group box. Available graph types are dependent on the number of selections you make with these list boxes. For example, if you want to generate a 3D surface plot, you must select a value in each list box. By default, values are selected in the X-axis and Y-axis list box enabling you to create histograms (for the X-axis variable) or 2D scatterplots (for the X-axis and Y-axis variables).

Histogram of X. Click the Histogram of X button to generate a histogram of the quantity selected in the X-axis list box. When there is more than one active network, individual histograms will be generated for each network whenever Activation is selected in the X-axis box.

X and Y. Click the X and Y button to generate a 2D scatterplot of the variables selected in the X-axis and Y-axis list boxes. When there is more than one active network, a multiple scatterplot will be generated that plots the selected values for all networks, where applicable. For example, if you select Activation in the X-axis box and an input variable in the Y-axis box, then click the X and Y button, only one scatterplot will be generated. It will contain an Activation by selected input variable plot for each of the active networks.

X, Y and Z. Click the X, Y and Z button to generate a 3D surface plot of the variables selected in the X-axis, Y-axis, and Z-axis list boxes. When there is more than one active network and Activation has been selected in one of the axis boxes, an individual surface plot will be generated for each network.

Training error. Click this button to produce a training graph for the active networks. Depending on which options were selected in the Real time training graph display group box (on the SANN - Custom Neural Network or SANN - Subsampling - Real Time Training Graph tab), the training graph will contain the train error, test error, or both.