* A new `sample` input was added to the `Outputs.add_observations` class method.
* Observations stored in `Outputs` class instances have an extra hierarchical layer to account for sample names. To access an observation, the sample name needs to be included, for example:
* `pcv.resize` deprecated and replaced with `pcv.transform.resize` and `pcv.transform.resize_factor`
python
pcv.outputs.observations["sample_name"]["variable_name"]