Text Mining & Basic Calculations

Supplemental Resources on Class Website

Concept Map

Big Data

Excel Features

Implementation

Data Mining

Yields Business Intelligence

Accuracy

Design

Objectives

▪Define Big Data and Data Mining

▪Explain the Accuracy principle of Spreadsheet Design

▪Demonstrate Excel features that support basic spreadsheet analytics.

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%

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

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%

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

▪Data sets too large to process with traditional database technology

Big Data

Data Mining Tools

▪software that searches through data

▪uses complex statistical calculations

▪outputs▪ Trends▪ Patterns▪ Correlations▪ Exceptions

Nestle

▪Nestle processes Social Media

http://uk.reuters.com/article/video/idUKBRE89P07Q20121026?videoId=238680321

Import

▪Access data not formatted as an Excel document

▪File type = txt or csv

Import – Step 1▪ File, Open, File type = All files

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Import – Step 2

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Import – Step 3

▪Save As File type = Excel Worksheet

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Text Mining

▪Search

▪Parse

▪Concatenate

▪SEARCH

▪LEFT, MID, RIGHT, LEN

▪&

SEARCH Function

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LEFT Function

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LEN or Length Function

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RIGHT Function

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MID Function

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Concatenate

▪& is the concatenate symbol

▪Quotes are required around constant strings of text

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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.

Copy Formula with Relative Cell Addresses

▪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)

▪SUM

▪AVERAGE

▪MIN and MAX

▪COUNT

Common Functions

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

▪ 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

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

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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)

Cell Reference Example #2

▪Which calculation needs a mixed cell reference?

▪Where should the $ go?

▪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

▪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

Paste Special - Values

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