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Oscillators: ROC (RATE OF CHANGE)
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The ROC (Rate Of Change) is also close to the momentum and the momentum%. It represents the momentum in percentage of fluctuation.

With:
P_t today's price.
P_t-n the price n days before.

The ROC is:

ROC_t = {(P_t - P_t-n) / P_t-n}%

The difference with the momentum% is that the ROC can have any value (unlike the momentum% that is always between +/- 100%).

Interpretation

The ROC line is very closed to the momentum(%) line. His interpretation is the same. The purchase signal is given by the momentum when it changes from a negative value to a positive and the sale signal when it's from positive to negative.

Graph Example: ROC

The ROC₁₅ is drawn on the bottom graph. The ROC gives us an indication of the speed of fluctuation of the prices.