§ 67.11 – How do I identify the sources of any errors?

(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.