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Data MiningSupplemental Resources on Class
Website
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Concept Map
Data Mining
Big Data
Implementation
Isolate Assumption
s
Design: Accurac
y
3-D Reference
s
Sum, Average, Min, Max,
Count, RandBetween
Paste Special
Mixed Cell Reference
s
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Objectives
▪Explain the Accuracy principle of Spreadsheet Design
▪Demonstrate Excel features that support basic data mining.
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▪Formula ▪ created by you▪= A1 + A10
▪Function ▪keyword defined by Microsoft▪=SUM(A1:D1)▪Functions are more flexible than formulas
Formula vs. Function
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Different Results
=B3+B4+B5+B6
=SUM(C3:C6)
If you delete Row 5=SUM(C3:C5)
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▪SUM
▪AVERAGE
▪MIN and MAX
▪COUNT
Common Functions
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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
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Vertical Copy
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Vertical vs. Horizontal Copy
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▪ Is the formula 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
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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
http://www.lacoste.pamplin.vt.edu/web1504/resources/video/ss.html
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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 Example #1
=SUM(B2:D2)
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Cell Reference Example #2
▪Which calculation needs a mixed cell reference?
▪Where should the $ go?
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▪Know the order of operations.
▪Select the correct function or construct the correct formula. (Choose a function over a formula.)
▪ Isolate assumptions.
▪Check relative and absolute cell references.
▪Double-check all calculations.
Spreadsheet Design: Accuracy
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▪Store numbers in cells
▪Write equations to point to cells containing numbers
Isolate Assumptions
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Isolate Assumption Example
Assumption
=E2+3 is incorrect=E2+H2 is correct
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Generate Data with RANDBETWEEN
▪= RANDBETWEEN(low, high)
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Paste Special - Values
http://www.lacoste.pamplin.vt.edu/web1504/resources/video/ss.html
MAC: Edit Menu, Paste Special
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3-D Reference
▪Cell reference that refers to a cell on a different worksheet
▪Function is on Sheet 1▪Summing cell A1 on Sheets 2 thru 13
=SUM(‘Sheet 2:Sheet 13’!A1)