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def quantile (x, p) correction in statistics.py #38

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def quantile (x, p) correction in statistics.py #38

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4 changes: 2 additions & 2 deletions code/statistics.py
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Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,7 @@ def median(v):

def quantile(x, p):
"""returns the pth-percentile value in x"""
p_index = int(p * len(x))
p_index = int(p * len(x)) - 1 # for sorted list x is indexed from 0 to len(x)-1
return sorted(x)[p_index]

def mode(x):
Expand Down Expand Up @@ -132,4 +132,4 @@ def correlation(x, y):
print "covariance(num_friends, daily_minutes)", covariance(num_friends, daily_minutes)
print "correlation(num_friends, daily_minutes)", correlation(num_friends, daily_minutes)
print "correlation(num_friends_good, daily_minutes_good)", correlation(num_friends_good, daily_minutes_good)