sig
type t
val empty : Sample.Summary.t
val add : Sample.Summary.t -> float -> Sample.Summary.t
val max : Sample.Summary.t -> float
val min : Sample.Summary.t -> float
val size : Sample.Summary.t -> int
val mean : Sample.Summary.t -> float
val variance : Sample.Summary.t -> float
val sd : Sample.Summary.t -> float
val skewness : Sample.Summary.t -> float
val kurtosis : Sample.Summary.t -> float
module Monoid : sig val mempty : t val mappend : t -> t -> t end
end