# OOF: Finite Element Analysis of Microstructures

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##
*/output/stress/statistics*

**type**- A variable indicating the type of quantity to be computed.
There are three choices: 1)
`cartesian`calculates the mean and standard deviation of each component of the stress tensor as defined by the screen horizontal and vertical directions; 2)`eigenvalues`calculates the mean and standard deviation of the principal stress (the eigenvalues, labeled`emax`,`emid`, and`emin`) and the shear (computed as half the absolute value of the difference between the largest and smallest eigenvalues). These quantities are frame invariant; 3)`extremes`calculates the extreme (maximum and minimum) values of both Cartesian and invariant quantities. The means, deviations, and extremes of the stress components are printed in the tensor format used by*/output/stress/selected*(3.38.1), although the extremes don't really form a tensor. 4)`invariants`calculates the mean and standard deviation of the first, second, and third invariants of the stress.

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