# Why do I see "NA" in the percentage change of a metric?

The **"NA"** is displayed when there is no data or values for the previous period of a given metric.

<figure><img src="/files/GWLkJWJVbjQUAh2fmDBS" alt="" width="375"><figcaption></figcaption></figure>

* **Why some metrics have data while others do not**:
  * It’s possible for certain metrics to show values while others don’t, depending on activity during the period.
    * For example:
      * **Cycle Time** might display as `6d` because tickets moved through the workflow.
      * **MTTR** (Mean Time to Recovery) could show `0`, as no hotfixes were pushed to release branches during that time.
* **Rationale for Showing "NA"**:
  * Instead of inaccurately reflecting a percentage change (e.g., showing an increase of `+100%`), **"NA"** provides a clearer indicator that the metric lacked data for the previous period.
  * This approach gives users a more accurate understanding of their metrics and avoids misleading interpretations.


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