The square root of the variance is the standard deviation. Investopedia / Alex Dos Diaz In statistics, variance measures variability from the average or mean. It is calculated by taking the ...

Definition: Standard deviation is the measure of dispersion of a set of data from its mean. It measures the absolute variability of a distribution; the higher the dispersion or variability, the ...

Python library to compute properties of quantum tight binding models, including topological, electronic and magnetic properties and including the effect of many-body interactions.