What is the mean of $S_i$?

In [54]:

    

import urllib2
import csv

url = ('https://raw.githubusercontent.com/Upward-Spiral-Science'
       '/data/master/syn-density/output.csv')
data = urllib2.urlopen(url)
fieldnames = ['x', 'y', 'z', 'unmasked', 'synapses']
reader = csv.reader(data)
reader.next()

rows = [[int(col) for col in row] for row in reader]


    

In [55]:

    

rows[0]


    

    
Out[55]:





[19, 1369, 55, 5063, 0]

In [56]:

    

mean_si = (1. * sum([row[-1] for row in rows])) / len(rows)