def std(self):
"""Standard deviation of binned data"""
vals = array(sortedDictValues(self.bins))
a = self.midpoints*vals
sum_bin_vals = sum(self.bins.values())
mean_val = sum(a) / sum_bin_vals
return sqrt(sum(((self.midpoints-mean_val)*vals)**2) / sum_bin_vals)
def mean(self):
"""Mean of binned data"""
a = self.midpoints*array(sortedDictValues(self.bins))
return sum(a) / sum(self.bins.values())
def values(self):
return sortedDictValues(self.bins)