To initiate a search for correlation between two sets of fields, select the Analysis>Correlations>Get correlations between fields command on the main menu. The Correlation analysis setup wizard will assist you with setting up search parameters.
The first box of the wizard (Fig. 3.8.1) has the following elements:
3.8.1. "ITYPE" checkbox. If this checkbox is checked, lists 3.8.3 and 3.8.4 will include all fields of the ITYPE type.
3.8.2. "FTYPE" checkbox. If this checkbox is checked, lists 3.8.3 and 3.8.4 will include all fields of the FTYPE type.
3.8.3. The "Set 1 (rows)" list contains fields that will be included into Set 1. Click "Mark all" to select all fields in the list and "Unmark all" to unselect all fields in the list.
3.8.4. The "Set 2 (columns)" list includes fields that will comprise Set 2. Click "Mark all" to select all fields in the list and "Unmark all" to unselect all fields in the list.
Figure 3.8.1.
1. "ITYPE" checkbox. 2. "FTYPE" checkbox. 3. The "Set 1" list of fields. 4. The "Set 2" list of fields. 5. The "Mark all" button that selects all fields in Set 1. 6. The "Unmark all" button that deselects all fields in Set 1. 7. The "Mark all" button that selects all fields in Set 2. 8. The "Unmark all" button that deselects all fields in Set 2. 9. The "Next" button that takes you to the next wizard box. 10. The "Cancel" button that cancels the calculations.
The second box of the Correlation analysis setup wizard (Fig. 3.8.2) has the following elements:
3.8.5. The "Correlation type" list that contains the following three correlation coefficients:
3.8.6. The "Threshold type" list contains four types of correlation coefficient thresholds (the matrix elements that exceed the threshold value are shown in red):
3.8.7. In the "Threshold value" field, set the value of the correlation threshold (see section 3.8.6).
Figure 3.8.2.
1. Types of correlation coefficients. 2. List of threshold types. 3. The threshold value input field. 4. The "Back" button that takes you to the previous wizard box. 5. The "Finish" button that allows you to finish working with the wizard and start calculations. 6. The "Cancel" button.
To finish working with the wizard and calculate the correlation, click "Finish". To move to the previous wizard box, click "Back"; to cancel the operation, click "Cancel".
Note. If the sets of fields have not been formed, the "Error" information box with the relevant messages will appear (Fig. 3.8.3).
Figure 3.8.3 "Error" information box.
When the calculation is in progress, you will see the "Please wait" information box (Fig. 3.8.4). This information box will disappear after the calculation is complete.
Figure 3.8.4 "Please wait" information box.
After the program completes the calculation, it will open a dialog box with the correlation matrix (see section 3.9 about this dialog box).