ci = ciquant(x,p,C); Input C is confidence level for the interval (default 0.95), p is the probability that define quantile, x is a sample; if x is a matrix, the procedure is colonwise. The interval ci is of the form [LeftLimit, PointEstimate, RightLimit]'. The interval is constructed conservatively in both ends, that is P(q<LeftLimit) <= C/2 and similarly for the upper limit. See also QUANTILE.