weighted_mean_sd function

Helper function to compute weighted mean and standard deviation

Helper function to compute weighted mean and standard deviation. Deals gracefully whether x is sparse matrix or not.

weighted_mean_sd(x, weights = rep(1, nrow(x)))

Arguments

• x: Observation matrix.
• weights: Optional weight vector.

Returns

A list with components. - mean: vector of weighted means of columns of x

• sd: vector of weighted standard deviations of columns of x