stats

mean(x, rep_x)	Estimate the \(\mathbb{G}\)-invariant mean of a random variable.
var(x, rep_x[, center])	Estimate the symmetry-constrained variance of \(\mathbf{X}:\Omega\to\mathcal{X}\).
var_mean(x, rep_x)	Compute var() and mean() under symmetry constraints.
cov(x, y, rep_x, rep_y)	Compute the covariance between two symmetric random variables.