§ 85.07 – What sample ratio should I use for the PPMT option?

(a)    You must use the ratio of sample total PMT over sample total PPMT as the sample ratio.

(b)   For estimating annual total PMT:

(1)   Use sample PMT/PPMT ratio for the entire sample if you do not group your service.

(2)   Use sample PMT/PPMT for each group if your sampling plan is based on grouping.

(c)    For estimating average daily PMT by type of service days, use the sample PMT/PPMT ratio by type of service days.