By Lawrence

Different data feeds offer different favour of the advance decline data to their customers. However, not all trading platforms are capable of letting the users to conduct calculations directly from multiple data series. Hence, odd combinations of the advance decline data are often provided as a workaround for the traders. These vendor provided ratios may not be what you want but don’t worry, following are formulas for converting these numbers.

## Definitions

D = Decline Issues

Advance Decline Ratio = A / D

Advance Issues Percentage = A / (A + D) * 100

Given R as Advance Decline Ratio,

Advance Issues Percentage = R / (R + 1) * 100

Given P as Advance Issues Percentage,

Advance Decline Ratio = P / (100 – P)

## Summary

No magic here, just handy formulas derived from their definitions. In case your trading platform only provides you with the advance decline ratio but you like to work with advance issues percentage instead, use the formula above will give you what you need.

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