(a) You must use the ratio of sample total PMT over sample total vehicle days as the sample average to estimate PMT.
(b) You must use the ratio of sample total UPT over sample total vehicle days as the sample average to estimate UPT.
(c) For estimating annual total PMT and UPT:
(1) Use the sample averages for the entire sample if you do not group your service.
(2) Use the sample averages for each group if your sampling plan is based on grouping.
(d) For estimating average daily PMT and UPT by type of service days, use the sample averages by type of service days. If your sample happens not to include any vehicle-days for a particular day type (e.g. Saturday), use the sample average for the entire sample.