LoanApplication distance function

gistfile1.java

public double calculateDistance(LoanApplication item, LoanApplication item2) {
   double distance = 0;
	
   //nominal attributes
   if (item.getCarrier() != item2.getCarrier()) distance += 1;
   if (item.getGender() != item2.getGender()) distance += 1;
	
   int dayDiff = Math.abs(item.getDayOfWeek() - item2.getDayOfWeek());
   if (dayDiff > 3) {
      dayDiff -=  1 + 2 * (dayDiff - 4);
   }
   distance += dayDiff * dayDiff;
	
   int timeOfDayDiff = Math.abs(item.getTimeOfDay() - item2.getTimeOfDay());
   if(timeOfDayDiff > 11) {
      timeOfDayDiff -= 1 + 2 * (timeOfDayDiff - 12);
   }
   distance += timeOfDayDiff * timeOfDayDiff;
	
   //scaled numeric range attributes
   //TODO: tune scale factors
   int requestedAmountDiff = item.getRequestedAmount() - item2.getRequestedAmount();
   requestedAmountDiff /= 100;
   distance += requestedAmountDiff * requestedAmountDiff;

   int yearlyIncomeDiff = item.getYearlyIncome() - item2.getYearlyIncome();
   yearlyIncomeDiff /= 10000;
   distance += yearlyIncomeDiff * yearlyIncomeDiff;

   return Math.sqrt(distance);
}