Tie Factors
Overview
When you create a tie, you specify the type of the tie, and the corresponding scale or offset value for each tied factor. Adams Insight then computes the value of the tied factors from the value of the tie.
If the tie type is Scale, Adams Insight uses the following formula:
current factor value = current tie value * component factor scale value
where:
■Current factor value is the value the factor becomes during the current trial.
■Current tie value is the value the tie assumes for the current trial.
■Component factor scale value is the value entered in the Tied Factors table in the tie Factor Form.
If the tie type is Offset, Adams Insight uses the following formula:
current factor value = current tie value + component factor offset value
For example, to symmetrically control two factors:
1. Create a Scale tie.
2. Set the nominal value of the tie to the desired positive value.
3. Set the scale of one tied factor to +1 and the other to -1.
If the tie value is 300, Adams Insight computes the value of the tied factors as +300 and -300.
How to tie factors
To tie factors:
1. Select two factors by holding down the Ctrl key while you select each factor with the left mouse button.
2. Select the Tie factors 
tool.
tool. 3. In the Factor Name text box, change the name to something meaningful.
4. Review the other factor properties, such as Nominal Values and Settings. If necessary, change them to the desired values.
5. Select the Tie tab.
6. Select Scale or Offset for Tie Type.
7. Enter a scale or offset for each tied factor, then select Apply.
Adams Insight updates the computed values for the tied factors.
When you create the tie, Adams Insight sets default values for the tie value, tie settings, and scale values for the tied factors. If the tied factors have the same value, Adams Insight automatically moves the value and settings to the tie and sets all scales to 1. If the tied factors have the same absolute values, Adams Insight automatically makes the tie the positive value, and sets all scales to +1/-1. Otherwise, Adams Insight sets the tie value to 1 and the tied factor scales to the tied factor nominal values.
To untie factors:
1. Select the tie in the treeview.
2. Select the Untie factors 
tool.
tool. 3. Adams Insight displays an alert asking whether you want to restore the original factor values.
4. Select Yes or No.
Adams Insight deletes the tie and moves the tied factors back to the top level of the treeview. If you asked to restore the original factor values, Adams Insight resets the factor nominal values to their original values (before they were tied). Otherwise, the factors retain the nominal values computed from the tie.