If you specify the keyword CLSUM, the procedure computes confidence limits for the total. The confidence coefficient is determined by the value of the ALPHA= option, which by default equals 0.05 and produces 95% confidence limits. The confidence limits are computed as

where is the estimate of the total, is the estimated standard deviation, and is the percentile of the t distribution with df calculated as described in the section t Test for the Mean.
If you specify the keyword UCLSUM, the procedure computes the onesided upper % confidence limit for the sum:

If you specify the keyword LCLSUM, the procedure computes the onesided lower % confidence limit for the sum:
