14. Why is it important to keep one unfiltered view when using filters with Google Analytics?

It is important to keep one unfiltered view when using filters with Google Analytics for several reasons:

1. Data Integrity: Having an unfiltered view allows you to have a reliable and accurate baseline of your website's performance. This view includes all the raw data without any modifications or exclusions. It serves as a reference point for comparison with other filtered views.

2. Troubleshooting: If you encounter any issues or discrepancies in your filtered views, having an unfiltered view can help you identify the source of the problem. By comparing the data in the unfiltered view with the filtered views, you can pinpoint any potential issues with your filters and make necessary adjustments.

3. Historical Data: Filters can permanently alter your data by excluding or modifying certain information. By maintaining an unfiltered view, you ensure that you have access to the complete historical data of your website. This is particularly useful for long-term analysis, trend identification, and benchmarking.

4. New Filters: When you want to implement new filters or make changes to existing ones, it is recommended to test them on a separate view before applying them to your main reporting views. This way, you can assess the impact of the filters without affecting your primary data. The unfiltered view serves as a control group for testing and validation purposes.

Overall, keeping one unfiltered view in Google Analytics is crucial for data integrity, troubleshooting, preserving historical data, and testing new filters. It provides a reliable reference point and ensures that you have a complete and accurate picture of your website's performance.