Created
May 24, 2019 14:44
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import math | |
import numpy as np | |
data_input = [5,6,8,12,15,18,10] | |
def mean(x): | |
return sum(x)/len(x) | |
def sum_of_squares(v): | |
"""v_1*v_1 +... +v_n*v_n""" | |
return np.dot(v,v) | |
def dev_mean(data): | |
# convert x by subtracting its mean ( so the result has mean 0) | |
x_bar = mean(data) | |
return [x_i - x_bar for x_i in data] | |
def variance(data): | |
# assumes x has at least two element | |
n = len(data) | |
deviations = dev_mean(data) | |
return sum_of_squares(deviations) / (n-1) | |
def standard_deviation(data): | |
return math.sqrt(variance(data)) | |
print(standard_deviation(data_input)) |
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