text mining & basic calculations supplemental resources on class website
TRANSCRIPT
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Text Mining & Basic Calculations
Supplemental Resources on Class Website
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Concept Map
Big Data
Excel Features
Implementation
Data Mining
Yields Business Intelligence
Accuracy
Design
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Objectives
▪Define Big Data and Data Mining
▪Explain the Accuracy principle of Spreadsheet Design
▪Demonstrate Excel features that support basic spreadsheet analytics.
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Facebook Users
▪1.28 billion users worldwide
▪802 million users login daily (up 21%)
▪67% of Internet users are on FB
▪50% of 18-24 year olds login when they wake up
▪45-54 year old age group has grown 46%
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Facebook Content
▪4.5 billion likes daily (up 67%)
▪30 million photos uploaded daily
▪1 in 5 page views in US
▪36% users post brand-related content on their walls
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King of Social Media
▪FB accounts for 66% of social media sharing on iPhones
▪Users with income over $75,000Facebook 73%Twitter 17%Pinterest 13%
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Facebook & e-commerce
▪10 million registered small businesses
▪Drives 26% of referral traffic to e-commerce sites
▪20% of shoppers prefer buying thru FB vs. e-commerce website
▪58% of businesses see a drop in marketing costs when moving to FB
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▪Data sets too large to process with traditional database technology
Big Data
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Data Mining Tools
▪software that searches through data
▪uses complex statistical calculations
▪outputs▪ Trends▪ Patterns▪ Correlations▪ Exceptions
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Nestle
▪Nestle processes Social Media
http://uk.reuters.com/article/video/idUKBRE89P07Q20121026?videoId=238680321
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Import
▪Access data not formatted as an Excel document
▪File type = txt or csv
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Import – Step 1▪ File, Open, File type = All files
http://www.lacoste.pamplin.vt.edu/web1504/resources/video/ss.html
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Import – Step 2
http://www.lacoste.pamplin.vt.edu/web1504/resources/video/ss.html
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Import – Step 3
▪Save As File type = Excel Worksheet
http://www.lacoste.pamplin.vt.edu/web1504/resources/video/ss.html
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Text Mining
▪Search
▪Parse
▪Concatenate
▪SEARCH
▪LEFT, MID, RIGHT, LEN
▪&
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SEARCH Function
http://www.lacoste.pamplin.vt.edu/web1504/resources/video/ss.html
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LEFT Function
http://www.lacoste.pamplin.vt.edu/web1504/resources/video/ss.html
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LEN or Length Function
http://www.lacoste.pamplin.vt.edu/web1504/resources/video/ss.html
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RIGHT Function
http://www.lacoste.pamplin.vt.edu/web1504/resources/video/ss.html
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MID Function
http://www.lacoste.pamplin.vt.edu/web1504/resources/video/ss.html
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Concatenate
▪& is the concatenate symbol
▪Quotes are required around constant strings of text
http://www.lacoste.pamplin.vt.edu/web1504/resources/video/ss.html
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Relative Cell Addressing
▪Relative is the default
▪When you copy a relative cell reference the reference will change depending on the direction and magnitude of the copy.
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Copy Formula with Relative Cell Addresses
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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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▪ 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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Paste Special - Values
http://www.lacoste.pamplin.vt.edu/web1504/resources/video/ss.html