From: Assessing the evolution of educational accessibility with self-avoiding random walk: insights from Helsinki
School visits per walk statistics/year
1991
1999
2007
2016
Non-school visiting node percentage
12.7%
16.5%
18.6%
24.3%
Mean
0.45
0.32
0.29
0.24
Standard deviation
0.55
0.46
0.43
0.42
Median
0.23
0.13
0.1
0.06