After using the Create TOPS interface, the user can move on to utilize other interfaces in the Sample Adequacy tab. Check Adequacy () is one available sample interface. This interface is used to view the new number of unsampled TOPS, required samples, and current samples for each stratum (Functional System, Volume Group, and Urban Code grouping). This allows users to quickly identify stratums that do not meet the sample adequacy requirements.
Table Elements
The table below describes the functions of the Table Elements in the Check Adequacy interface.
| Table Element | Description |
| Second Column | Displays the precision level (confidence level – precision rate) used to calculate the number of required samples. These values can be edited in the Precision Level interface in the Sample Adequacy tab. |
| Third Column | Displays a caution symbol or green check mark. |
| Caution Symbol | Indicates that a stratum has an insufficient number of samples. |
| Adjacent Number (to Caution Symbol) | Denotes how many stratums are deficient. |
| Carets | Allows users to expand or collapse the stratum data. |
Cell Information
Each cell under the Volume Group section contains three numbers:
- The number of unsampled TOPS Sections -- the number of TOPS locations that do not have a Sample ID for the stratum.
- The number of required samples -- the number of samples needed for this sample stratum, calculated using FHWA’s Sample Size Estimation equation.
- The number of provided samples -- the number of TOPS locations that do have a Sample ID for the stratum.
The first number will appear as a link that opens the Potential Samples interface on the Sample Adequacy tab. This allows the users to easily add samples to a stratum with an insufficient number of samples (denoted by the third number in a cell being red). Below is a visual that shows each number type and style on a sample Volume Group cell.
Comments
0 comments
Please sign in to leave a comment.