(a) If you have identified any error from the previous step, you should start with the calculations you did in processing the sample data to determine if an error is a calculation error or an error in the sample data.
(b) Check if you have correctly calculated loads, UPT, PMT, and APTL.
(c) Check if you have used between-stop distances and loads consistently:
(1) If you use leaving loads, you must use the distance to the next stop. The distance should be zero for the ending point of a one-way trip.
(2) If you use arriving loads, you must use the distance from the previous stop. The distance should be zero for the beginning point of a trip.
(d) Check the predetermined between-stop distances you entered.
(e) Compare your calculated load with the observed load from the field.