# LINT_REVERSED_SERIES

A series is reversed before a running calculation, so early bars read later ones.

## What happened

A running calculation on a reversed series walks from the last bar to the first. Turned back round, each bar holds a value built from the bars after it.

## What to do

Run the calculation on the series in its own order.

## Example

```text
strategy.py, line 25: Reversing a series before a running calculation lets early bars read later ones. [LINT_REVERSED_SERIES]
```

The wording of the message depends on your file, and the code does not. A warning does not stop the file from loading.