> For the complete documentation index, see [llms.txt](https://awsnotes.dendron.so/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://awsnotes.dendron.so/machine-learning/amazon-forecast/topics/importing-datasets.md).

# Importing Datasets

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This page was generated from content adapted from the [AWS Developer Guide](https://github.com/awsdocs/amazon-forecast-developer-guide.git)
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## Related Time Series

* **Note**\
  A related time series that contains any values within the forecast horizon is treated as a forward-looking time series.
* **Note**\
  To upgrade an existing predictor to AutoPredictor, see [Upgrading to AutoPredictor](https://github.com/kevinslin/aws-reference-notes/blob/main/services/amazon_forecast/howitworks-predictor.md#upgrading-autopredictor)

## Item Metadata

* **Note**\
  To upgrade an existing predictor to AutoPredictor, see [Upgrading to AutoPredictor](https://github.com/kevinslin/aws-reference-notes/blob/main/services/amazon_forecast/howitworks-predictor.md#upgrading-autopredictor)

## Handling Missing Values

* **Important**\
  For both target and related time series datasets, `mean`, `median`, `min`, and `max` are calculated based on a rolling window of the 64 most recent data entries before the missing values.