ACIS 1504 - Introduction to Data Analytics & Business Intelligence

Data MiningAccuracy Design Goal

Concept Map

Implementation

Mixed Cell References

Design: Accuracy

Common Functions

Data Mining

Isolate Assumptions

Objectives

• Define Data Mining

• Explain the Accuracy spreadsheet design goal.

• Demonstrate Excel features that support the Accuracy design goal.

Segment A:Data Mining

Data Mining Tools• software that searches vast amounts of data

• uses complex statistical calculations

• outputs• Trends• Patterns• Correlations• Exceptions

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

Segment B:Formula vs. Function

• Formula • created by you• = A1 + A10

• Function • keyword defined by Microsoft• =SUM(A1:D1)• Functions are more flexible than formulas

Formula vs. Function

Different Results

=B3+B4+B5+B6

=SUM(C3:C6)

If you delete Row 5=SUM(C3:C5)

Segment C:Common Functions

• SUM

• AVERAGE

•MIN and MAX

• COUNT and COUNTA

Common Functions

Common Functions for Payroll

Common Functions for Payroll• Open Common Calculations.xls

• Select the Payroll worksheet

Common Functions for PayrollAdd 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.

LiveScribe SmartPen

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

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

Segment D:Mixed Cell References

Cell Address Reference Changes when Copied

A1 Relative Vertically or Horizontally

$A$1 Absolute Never

$A1 Mixed Vertically

A$1 Mixed Horizontally

Relative, Absolute & Mixed Cell References

Relative vs. Absolute

Relative Cell References

Absolute Cell References

Cell Address Reference Changes when Copied

A1 Relative Vertically or Horizontally

$A$1 Absolute Never

$A1 Mixed Vertically

A$1 Mixed Horizontally

Relative, Absolute & Mixed Cell References

Mixed Cell References

• 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

Cell Reference Decisions

CopyFormula?

Vertical orHorizontal?

ChangeRows?

ChangeColumns?

Yes

No Stop

HorizontalVertical

YesYes

Stop

No

Enter $ beforecolumn letters

that shouldnot change

No

Enter $ beforerow numbers that shouldnot change

Start

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

Peter Rabbit Example

Open Common Functions workbook, select Peter Rabbit sheet.

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 sum4. Do the same for Mopsy & Peter by

copying Flopsy’s formula.

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.

MPG Example

1. Calculate MPG for Compact Car2. Copy to other vehicles3. Copy to next year

Open Common Functions workbook, select MPG sheet.

Segment E:Accuracy

• 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

• Parentheses

•Multiplication and Division

• Addition and Subtraction

Order of Operations

1. 6 / 2 * 4 =

2. 3 + 2 * 2 – 1 =

3. ( 2 * 5 ) + 15 / 5 =

Order of Operations Examples

12

6

13

• Store numbers in cells

•Write equations to point to cells containing numbers

Isolate Assumptions

Isolate Assumption Example

Assumption

=E2+3 is incorrect=E2+H2 is correct

Isolate Assumptions?

Have I isolated assumptions?

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