Assertion: mean absolute deviation | /r/HasAspect | bad mathematical properties
Facets:
Source sentences:
text: This is just the reverse way of the usual text-book line of arguments, that (1) the mean deviation from the mean is always zero, that (2) the mean absolute deviation is positive but has "bad mathematical properties", and that finally (3) the mean squared deviation (=variance) is also positive but with "nice" mathematical properties.