Statistical moment

First Order Moments

E(poly[, dist])	The expected value of a distribution or polynomial.
E_cond(poly, freeze, dist, **kws)	Conditional expected value of a distribution or polynomial.

Second Order Moments

Std(poly[, dist])	Standard deviation.
Var(poly[, dist])	The variance of a distribution or polynomial.
Cov(poly[, dist])	Variance/Covariance matrix of a distribution or polynomial array.

Higher Order Moments

Skew(poly[, dist])	The third order statistical moment Kurtosis.
Kurt(poly[, dist, fisher])	The forth order statistical moment Kurtosis.

Correlation Functions

Corr(poly[, dist])	Correlation matrix of a distribution or polynomial.
Acf(poly, dist[, n_steps])	Auto-correlation function.
Spearman(poly[, dist, sample, retall])	Calculate Spearman's rank-order correlation coefficient.