If, as is usually the case, the PDF of the derived quantity has not been found, and even if the PDFs of the measured quantities are not known, it turns out that it is still possible to estimate the mean and variance ( and, thus, the standard deviation ) of the derived quantity.
32.
The GRS-80 ( Geodetic Reference System 1980 ) as approved and adopted by the IUGG at its Canberra, Australia meeting of 1979 is based on the equatorial radius ( semi-major axis of Earth ellipsoid ) a, total mass GM, dynamic form factor J _ 2 and angular velocity of rotation \ omega, making the inverse flattening 1 / f a derived quantity.
33.
To clarify these effective template derived quantities, we let " q " be " any " quantity within some scope of context ( not necessarily base quantities ) and present in the table below some of the most commonly used symbols where applicable, their definitions, usage, SI units and SI dimensions where [ q ] is the dimension of " q ".
34.
Finding the center of the storm and tracking its motion is a highly derived quantity that depends on many other factors, such as wind fields and moisture content and surface temperatures, etc . So, even if they found that the predictions were systematically wrong, it could be very difficult to identify what part of the model needed to be fixed . talk ) 18 : 15, 27 August 2011 ( UTC)
35.
For these special topics, see the referenced articles, as the presentation below will be principally confined to the mathematical structure ( Minkowski metric and from it derived quantities and the Poincare group as symmetry group of spacetime ) " following " from the invariance of the spacetime interval on the spacetime manifold as consequences of the postulates of special relativity, not to specific application or " derivation " of the invariance of the spacetime interval.
36.
The OED has the geometrical definition " " A mode of linear measurement, magnitude, or extension, in a particular direction; usually as co-existing with similar measurements or extensions in other directions . " ", but you have asked the question at the science desk, so perhaps you want Joseph Fourier's definition in " Th�orie anal . de la Chaleur ( 1822 ) " : " " The power to which any one of the fundamental quantities or units is raised in the expression defining a derived quantity or unit in terms of them; also ( in pl . ), all the fundamental quantities in such an expression, each raised to its appropriate power, which together show how the unit of the derived quantity depends on the fundamental units; method of dimensions, dimensional analysis " ".
37.
The OED has the geometrical definition " " A mode of linear measurement, magnitude, or extension, in a particular direction; usually as co-existing with similar measurements or extensions in other directions . " ", but you have asked the question at the science desk, so perhaps you want Joseph Fourier's definition in " Th�orie anal . de la Chaleur ( 1822 ) " : " " The power to which any one of the fundamental quantities or units is raised in the expression defining a derived quantity or unit in terms of them; also ( in pl . ), all the fundamental quantities in such an expression, each raised to its appropriate power, which together show how the unit of the derived quantity depends on the fundamental units; method of dimensions, dimensional analysis " ".
