# DataScan.compare()


Compare this scan against a baseline and return the differences.


Usage

``` python
DataScan.compare(baseline)
```


The comparison covers schema changes (columns added, removed, or with changed types) and statistical drift for columns present in both scans. The returned [DataScanDiff](DataScanDiff.md#pointblank.DataScanDiff) object provides programmatic access to the results and a tabular report via `get_tabular_report()`.


## Parameters


`baseline: DataScan`  
The baseline [DataScan](DataScan.md#pointblank.DataScan) to compare against (typically the older scan).


## Returns


`DataScanDiff`  
An object describing the differences between the two scans.