For installation of the Index of the Relative cheerfulness, we should click the button Indicators at a toolbar and select from the appeared menu Ocillators - relative vigor Index
After that, appears a window where we can change properties of the exposed indicator. We can select the averaging period, fix a maximum and a minimum, and also to select visual settings.
The indicator is based on idea of that in the bull market the price of closing is, as a rule, higher, than the opening price.
Reverse is fair for the bear market.
Thus, cheerfulness is defined as growth existence
also it is calculated on the following formula:
In this indicator zones of oversold and overpurchase are not provided by default
Books on Forex are advised independently to put these zones that gives to a method still big ambiguity and possibility of adjustment to history.