Spreadsheet and Database Decision Support - PowerPoint PPT Presentation

Spreadsheet and database decision support l.jpg
Download
1 / 32

Spreadsheet and Database Decision Support. Power Excel and Access for Business Analysts. High Level Structure. Data Warehousing (Access). Data Cleaning and Transformation (Excel). Online Analytical Processing (OLAP) (Excel). Session 1. Advanced Data Querying and Analysis

Related searches for Spreadsheet and Database Decision Support

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

Download Presentation

Spreadsheet and Database Decision Support

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Spreadsheet and database decision support l.jpg

Spreadsheet and Database Decision Support

Power Excel and Access for Business Analysts


High level structure l.jpg

High Level Structure

Data Warehousing

(Access)

Data Cleaning and Transformation

(Excel)

Online Analytical

Processing (OLAP)

(Excel)

Session 1

Advanced Data Querying and Analysis

(Excel and Access)

Session 2

Models and

Modeling

(Excel)

Building DSS

With VBA

(Excel)

Take MIS 436


Module overview and session themes l.jpg

Module Overview and Session Themes

  • Data is good.

  • Data is often not enough, need models too.

  • Models+Data+VBA = Decision support system


More themes l.jpg

More Themes

  • Spreadsheets are de facto the most widely used platform for modeling and analysis in business today

  • Excel has rich set of modeling and analysis tools

  • End user DSS development

    • A wide open opportunity for stardom

  • "Things should be made as simple as possible, but not any simpler." Albert Einstein


Data extraction transformation and loading l.jpg

Data Extraction, Transformation, and Loading

Playing in the Mud


The many roles of knowledge workers l.jpg

The Many Roles of Knowledge Workers

Brilliant IS idea


The gist of the problem l.jpg

The Gist of the Problem

  • Getting data out of some system to:

    • Analyze it (e.g. Excel, Access, stats package)

    • Get it into another system (e.g. ERP or Data Warehouse)

  • “Smart” manipulation of electronic reports with embedded data

  • Don’t want to do it manually (why?)


Slide9 l.jpg

ACD Report Example

Report Header

Date

Split

Blank lines

Data!

Totals Lines

Next

report


Why talk about this l.jpg

Why Talk About This?

  • Deloitte & Touche – Data Quality and Integrity

  • Beaumont Oracle ERP project

  • Huge amount of time wasted doing manual processing

  • Really useful spreadsheet and database skills (and mindset)

  • It’s fun to play in the mud sometimes


Ok let s start with a little toy data extraction problem l.jpg

OK, Let’s start with a little toy data extraction problem

  • Download PatientLocationLog.txt from the ATiB Downloads section (right click – Save Target As…)

  • Somehow, get it into Excel so you can analyze it

  • This is a table of entries of patients to various locations in a clinic. Note that each patient may visit multiple locations.


About the data l.jpg

About the Data

A patient type code

Location ID

When patient entered and exited

the location.

Unique Patient

Arrival ID


Your challenge l.jpg

Your Challenge

  • How many times did a patient with PatientType=2 enter Location 38?

    • If you get that, how might you quickly find how many patients of each type entered each location?

  • What date, time and day of the week did the very first patient arrive to location 31?

  • How much total time (in minutes) did the patient with ArrivalID=16 spend in the clinic?


Data warehousing and olap l.jpg

Data Warehousing and OLAP

Data is good

A Dimensional Modeling Manifesto

An Overview of Data Warehousing and OLAP Technology


What is a data warehouse l.jpg

What is a Data Warehouse?

  • Subject oriented

  • Integrated

  • Time-Variant

  • Nonvolatile

  • Data enters DW from operational environment, transaction processing systems (TPS).

Data is:

Source: Inmon, W.H., “What is a Data Warehouse?”, PRISM, Vol 1. No. 1

http://www.cait.wustl.edu/cait/papers/prism/vol1_no1/


1 subject orientation l.jpg

Source: Inmon, W.H., “What is a Data Warehouse?”, PRISM, Vol 1. No. 1

1. Subject Orientation

  • TPS organized around processes, functions

    • billing, banking, purchasing, payroll, etc.

  • DW organized around subjects

    • customers, vendors, encounters, sales

  • Transactions

    • TPS processes transactions

    • DW stores summary info related to transactions

  • TPS - keeps data needed for transaction

  • DW - keeps data needed for analysis


2 integration l.jpg

Source: Inmon, W.H., “What is a Data Warehouse?”, PRISM, Vol 1. No. 1

2. Integration

  • DW must integrate data from different apps

  • Create consistency across applications

    • naming conventions

    • measurement of variables (units)

    • data types

    • encoding

  • DSS analyst - use the data, not worry about credibility/consistency of data

    • often best person to find subtle data problems


3 time variancy l.jpg

Source: Inmon, W.H., “What is a Data Warehouse?”, PRISM, Vol 1. No. 1

3. Time Variancy

  • TPS accurate at moment of access

  • DW accurate as of some moment in time

Operational - current value data

Data warehouse - snapshot data

  • Time horizon 5-10 years

  • Key contains an element of time

  • Once snapshot made, data cannot be updated

  • Time horizon 60-90 days

  • Key may or may not have an element of time

  • Data can be updated


4 nonvolatility l.jpg

4. Nonvolatility

Change

Replace

Insert

Insert

Load

Access

Delete

Change

Operational

Data warehouse

Source: Inmon, W.H., “What is a Data Warehouse?”, PRISM, Vol 1. No. 1


The dw and olap value chain l.jpg

The DW and OLAP Value Chain


Multi dimensional data modeling l.jpg

Multi-dimensional Data Modeling

  • Designed to facilitate analysis (not transactions)

  • Common in data warehousing

  • Intuitive concept of many dimensions or perspectives on business measures or facts

    • view sales from customer, product and time perspective

  • Conceptual model

  • Hypercube – an “n-sided cube”


Data hyper cubes l.jpg

Data (Hyper) cubes

2-d to 3-d cube

Rotating the cube


A call center example tech support for ms office l.jpg

A Call Center ExampleTech Support for MS Office

  • Technology enabled business processes

  • Massive amount of data captured by ACD

  • Some data analysis done by ACD

  • Difficult operational questions related to staffing/scheduling impact on service level

  • Created simulation model to generate lots o’ data

  • Many call centers in many industries


Steps in multi dimensional modeling call center example l.jpg

Steps in Multi-dimensional ModelingCall Center Example

  • Choose business process

    • Servicing technical support calls

  • Choose grain of process

    • Individual phone calls

  • Choose dimensions

    • Customer, application, problem, time

  • Choose measured facts

    • time on hold, service time of call


  • The star schema a multi dimensional data model l.jpg

    Time dimension

    Customer dimension

    Fact table

    Problem dimension

    Application dimension

    The Star SchemaA multi-dimensional data model

    Non-normalized

    Non-normalized

    Non-normalized

    Normalized

    Non-normalized


    A sales star l.jpg

    A Sales Star


    Data models relational vs multi dimensional l.jpg

    Transaction focused

    Focus on many linked, normalized tables

    One big complex data model

    Very little redundancy

    Analysis focused

    Normalized fact table joined to a few highly non-normalized dimension tables

    Many simple, intuitive data models

    Lots of redundancy

    Data Models Relational vs. Multi-dimensional


    One e r vs many stars l.jpg

    One E-R vs. Many Stars

    Analysis

    focus

    Transaction

    focus

    One E-R model for all the business process.

    One star per modeled business process.


    What is olap l.jpg

    What is OLAP?

    • Software tool providing multi-dimensional view of data for business analysis

    • Example of “Decision Support” or “Business Intelligence” tool

    • Fast data access and fast computations

    • Interactive, flexible user interface

    • “Slice, dice, drill-down”

    • Excel Pivot Table and Pivot Chart


    Data warehousing and olap www resources l.jpg

    Data Warehousing and OLAPWWW Resources

    • A Dimensional Modeling Manifesto – Kimball, R. http://www.dbmsmag.com/9708d15.html

    • Kimball and Associates http://www.ralphkimball.com./html/articles.html

    • DSS Resourceshttp://dssresources.com/

    • Data Warehousing Information Center http://www.dwinfocenter.org/

    • Intelligent Enterprise http://www.intelligententerprise.com/


    Some good books l.jpg

    Some Good Books

    • The Data Warehouse Toolkit – Kimball, R.

      • Definitive

    • OLAP Solutions – Thomsen, E.

      • Definitive

    • Unlocking OLAP with Microsoft SQL Server and Excel 2000 – Freeze

      • For newbies

    • Microsoft OLAP Unleashed – Peterson and Pinkelman

      • For techasauruses


    Let s olap l.jpg

    CallCenter_Scenario01_DW.zip

    CallCenterPivot.zip

    Let’s OLAP

    • Download and unzip the following from the ATiB page accessible from my home page:

    http://www.sba.oakland.edu/faculty/isken/isken.htm

    http://www.sba.oakland.edu/faculty/isken/ATiB406_Downloads.htm

    • Let’s look at Excel Pivot Tutorial


  • Login