Overview
The INTERVALS statement tabulates various statistical
intervals for selected process variables. The types of
intervals you can request include
- approximate simultaneous prediction intervals for
future observations
- prediction intervals for the mean of future
observations
- approximate statistical tolerance intervals that contain
at least a specified proportion of the population
- confidence intervals for the population mean
- prediction intervals for the standard deviation of
future observations
- confidence intervals for the population standard deviation
These intervals are computed assuming the data are sampled
from a normal population. See Hahn and Meeker (1991) for
a detailed discussion of these intervals.
You can use options in the INTERVALS statement to
- specify which intervals to compute
- provide probability or confidence levels for intervals
- suppress printing of output tables
- create an output data set containing interval information
- specify interval type (one-sided lower, one-sided upper,
or two-sided)
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.
