Running Percentile Calculator

Calculate Running Percentile



What is a Running Percentile?

A running percentile is a statistical measure that calculates the percentile of a set of data at a specific point in time in a continuous stream of data. It is often used in time series analysis to understand the distribution of data points and identify trends or anomalies. The running percentile is updated each time a new data point is added to the series, providing a dynamic view of the data’s behavior over time.

Formula

The formula to calculate the running percentile (RP) is:

\[ RP = \left(\frac{(n + 1) \cdot P}{100}\right) \]

Where:

Example

Let's say you have 50 observations and you want to find the 90th percentile. Using the formula:

\[ RP = \left(\frac{(50 + 1) \cdot 0.90}{100}\right) = 0.459 \]

So, the running percentile (RP) is approximately 0.459.