This function returns the trace of an n-by-n square matrix x,  defined to be the sum of the elements
   on the main diagonal (the diagonal from the upper left to the lower right).

Facilitates treatment of statistical model specifications
    as things that can be generated and manipulated programmatically.
    Structural equation models may be specified with reticular action model matrices or paths,
    linear structural relations matrices or paths, or
    directly in matrix algebra.
    Fit functions include full information maximum likelihood,
    maximum likelihood, and weighted least squares.
    Example models include confirmatory factor, multiple group, mixture
    distribution, categorical threshold, modern test theory, differential
    equations, state space, and many others.

tr: trace

Description

Usage

Arguments

Details

See Also

Examples