jachym
commented
6 years ago I doubt, which "phenomenon" is mentioned here. The shortest path to some stop can be pre-calculated again using "network allocation" algorithm, as described for example in https://grass.osgeo.org/grass74/manuals/v.net.alloc.html#examples
Anyway, we need imported street network data in the database as well as the data with public transport stops and shortest path search algorithm. This tool is implemented in most of the GIS packages.
In order to prepare the analyses of optimizing routes to the nearest public transport stop the users can use the tools available through QGIS such as Buffer, Optimal route and Heatmap. The analytical process consists in determining the zones around the object, determining the shortest path between the point and the stop (tram, bus), and determining the intensity oft the phenomenon. The layers that will be used for analytical purposes will be the linear layer: roads and point layers: tram, bus stops.