Graph networks can be analyzed by computing global integration, local integration and inbetween centrality. For each street these values are computed and stored as object attribute integrationGlobal, integrationLocal, and inbetweenCentrality. The values can be visualized or used to approximate street widths.
In order to open the dialog, select a set of graph segments or a graph layer and click Graph > Analyze Graph... from the main menu.
Settings
Mode  Three modes are available:

Depth of local integration  The number of 90 degree turns to take into account to compute the local integration value. 
Street Width Min  Street width lower bound, only used in Set street width mode. 
Street Width Max  Street width upper bound, only used in Set street width mode. 
Definitions
All shortest paths between all selected street segments are computed. The shortest path cost function is the sum of all angles between the segments along the path.
Global integration
For each street segment, the shortest paths to all other segments are summed up. Each sum is then divided by the square of the number of segments. Next, each value is inverted. Finally, the values are normalized so that each value is in the range zero to one.
Local integration
For each street segment, the shortest paths to all other segments which are closer than (Depth of local integration) 90 degree turns are summed up. Each sum is then divided by the square of the number of visited segments. Next, each value is inverted. Finally, the values are normalized so that each value is in the range zero to one.
Inbetween centrality
For each street segment, the number of shortest paths which pass this segment is computed. Then, the values are normalized so that each value is in the range zero to one.