The Advance/Decline Volume Line is a breadth indicator which is calculated by taking the difference between the volume of advancing and declining issues
and adding the result to the previous value. It rises when advancing volume exceeds declining volume and falls when declining volume exceeds advancing volume.
It's important to compare Advance/Decline Volume Line plotted for the index with the performance of the actual index. The AD Volume Line should confirm an advance or a
decline with similar movements.
