### Archive

Archive for October 27th, 2009

## On Utilities Consumption I: Water

I've plotted the average consumption, and the two-sigma 95% bounds I calculated using Bessel's correction of the standard deviation for samples, aka "sample standard deviation": $\sqrt{\frac{1}{N-1}\sum_{i=1}^{N}\left(x_i - \overline{x} \right)^2 }$.  The correction gives an unbiased variance, even though the standard deviation is slightly underbiased... not that it matters much anyway.