A Two-Phase Heuristic Algorithm for the Problem of Scheduling and Vehicle Routing for Delivery of Medication to Patients

Table 3

	Frequency function for each customer ; may be weekly, biweekly or monthly.
	Frequency normalization function, transforms any working day of month and standardizes it to its parallel working day according to the frequency of customer .
	Demand of customer .
	Service time of customer .
	Mean time estimator for the set of routes, obtained from:
	Coordinates and for customer .
	Center for each coordinate, defined as the average of the sum of the and values.