specifies values of , the probability or confidence associated with the interval. For example, the following statements tabulate the default intervals at probability or confidence levels of , , , and :

proc capability data=steel;
   intervals width / alpha = 0.05 0.10 0.15 0.20;
run;

Note that some references use to denote probability or confidence levels. Values for the ALPHA= option must be between 0.00001 to 0.99999. By default, values of 0.01, 0.05, and 0.10 are used.

prediction, k-values forprediction, -values for lists values of for prediction intervals. Default values of 1, 2, and 3 are used for the prediction interval for future observations and for the prediction interval for the mean of future observations. Default values of 2 and 3 are used for the prediction interval for the standard deviation of future observations. The values must be integers.

specifies which intervals are computed. The indices can range from 1 to 6, and they correspond to the intervals described in Table 5.46.

For example, the following statements tabulate confidence limits for the population mean (METHOD=4) and confidence limits for the population standard deviation (METHOD=6):

proc capability data=steel;
   intervals width / methods=4 6;
run;

Formulas for the intervals are given in Methods for Computing Statistical Intervals. By default, the procedure computes all six intervals.

suppresses the tables produced by default. This option is useful when you only want to save the interval information in an OUTINTERVALS= data set.

specifies an output SAS data set containing the intervals and related information. For example, the following statements create a data set named INTS containing intervals for the variable WIDTH:

proc capability data=steel;
   intervals width / outintervals=ints;
run;

See OUTINTERVALS= Data Set for details.

tolerance, p-values fortolerance, -values for lists values of for the tolerance intervals. These values must be between 0.00001 to 0.99999. Note that the P= option applies only to the tolerance intervals (METHODS=3). By default, values of 0.90, 0.95, and 0.99 are used.

determines whether the intervals computed are one-sided lower, one-sided upper, or two-sided intervals, respectively. See Computing One-Sided Lower Prediction Limits for an example. The default interval type is TWOSIDED.