1. ACIS 1504 - Introduction to Data Analytics & Business Intelligence Data Mining Accuracy Design Goal

2. Concept Map Implementation Mixed Cell References Design: Accuracy Common Functions Data Mining Isolate Assumptions

3. Objectives Define Data Mining Explain the Accuracy spreadsheet design goal. Demonstrate Excel features that support the Accuracy design goal.

4. Segment A: Data Mining

5. Data Mining Tools software that searches vast amounts of data uses complex statistical calculations outputs Trends Patterns Correlations Exceptions

6. Data Mining in the Insurance Industry http://www.teradata.com/Resources/Videos/Towers-Watson- Using-Telematics-Data-to-Mitigate-Drivers-Risk- Globally/?LangType=1033&LangSelect=true

7. Segment B: Formula vs. Function

8. Formula created by you = A1 + A10 Function keyword defined by Microsoft =SUM(A1:D1) Functions are more flexible than formulas Formula vs. Function

9. Different Results =B3+B4+B5+B6 =SUM(C3:C6) If you delete Row 5 =SUM(C3:C5)

10. Segment C: Common Functions

11. SUM AVERAGE MIN and MAX COUNT and COUNTA Common Functions

12. Common Functions for Payroll

13. Open Common Calculations.xls Select the Payroll worksheet

14. Common Functions for Payroll Add functions to calculate each of the following: 1.Gross Pay for each employee is Hourly Rate times Hours Worked. 2.Total Payroll which is equal to Gross Pay for all employees. 3.Total Hours Worked by all employees. 4.Average Hourly Wage. 5.Number of Employees on the payroll.

15. LiveScribe SmartPen https://www.youtube.com/watch?v=U4RwtmwAJ5c

16. Smart Pen Sales Example Open SmartPen Sales.xls Calculate: Extended Price = Quantity x Unit Price Subtotal = Extended Price + Shipping Tax is 6% of Subtotal Total = Subtotal + Tax

17. Segment D: Mixed Cell References

18. Cell AddressReferenceChanges when Copied A1RelativeVertically or Horizontally $A$1AbsoluteNever $A1MixedVertically A$1MixedHorizontally

19. Relative vs. Absolute Relative Cell References Absolute Cell References

20. Cell AddressReferenceChanges when Copied A1RelativeVertically or Horizontally $A$1AbsoluteNever $A1MixedVertically A$1MixedHorizontally

21. Mixed Cell References

22. Is the calculation entered going to be copied? If so, which direction? If it’s copied vertically, do you want the row references to change? If it’s copied horizontally, do you want the column references to change? Do you want such a change to take place? Cell Reference Decisions

24. 1.Will you copy this function? 2.If so, which direction: vertical or horizontal? 3.If you copy vertically, Excel will automatically change all relative row references. Do you want those row references to change? Cell Reference Decisions = SUM(B2:D2 ) = SUM(B3:D3 ) = SUM(B4:D4 ) = SUM(B5:D5 ) 90 120 90

25. Peter Rabbit Example Open Common Functions workbook, select Peter Rabbit sheet.

26. Peter Rabbit Example – Vertical Copy Select the Peter Rabbit worksheet. As you complete these calculations, consider if any cell references need to be mixed. 1.Sum Flopsy’s three scores. 2.Copy this sum to Mopsy & Peter. 3.Add Factor A to Flopsy’s sum 4.Do the same for Mopsy & Peter by copying Flopsy’s formula.

27. Peter Rabbit Example – Horizontal Copy As you complete these calculations, consider if any cell references need to be mixed. 1.Average the three values for Score 1. 2.Copy this average to Score 2 and 3. 3.Deduct Factor B from the average of Score 1. 4.Do the same for Score 2 and 3 by copying Score 1’s formula.

28. MPG Example 1.Calculate MPG for Compact Car 2.Copy to other vehicles 3.Copy to next year Open Common Functions workbook, select MPG sheet.

29. Segment E: Accuracy

30. Select the correct function or construct the correct formula. (Choose a function over a formula.) Check mixed, relative and absolute cell references. Double-check all calculations. Know the order of operations. Isolate assumptions. Spreadsheet Design: Accuracy

31. Parentheses Multiplication and Division Addition and Subtraction Order of Operations

32. 1.6 / 2 * 4 = 2.3 + 2 * 2 – 1 = 3.( 2 * 5 ) + 15 / 5 = 12 6 13

33. Store numbers in cells Write equations to point to cells containing numbers Isolate Assumptions

34. Isolate Assumption Example Assumption =E2+3 is incorrect =E2+H2 is correct

35. Isolate Assumptions? Have I isolated assumptions? How Do You Spend Your Study Time?