The Delete Samples interface can be used to reduce over-populating or to relocate a sample by deleting it in this interface and adding it back in Potential Samples. After using Check Adequacy to check if a sample stratum is oversampled, the user can utilize the Delete Samples interface to delete such stratums. If the number of provided samples is significantly more than the number of required samples in the Check Adequacy table, the stratum may be oversampled, and samples might need to be deleted.

Location

The Delete Samples interface can be accessed by selecting the Sample Adequacy tab. This interface is marked by a purple trashcan icon (), and it is the last icon in the Sample Adequacy section. 

Steps

To delete a sample, follow these steps:

1. Select the desired data table year in the “Year” picklist.
2. Select the desired “Data” table to use in the Data picklist.
3. Click the “Find Samples” button to find all sampled segments in a data table.
4. Click the “Save Changes” button to save changes to the selected sample and data table. To save changes back to the source data, the “Save to Source” checkbox needs to be selected before clicking the “Save Changes” button.

Note

If a stratum contains three segments or fewer, the FHWA requires all segments to be sampled. It is not advised to delete a sample in a stratum with three or less segments.