Online Analytical Processing

On-Line Analytical Processing (OLAP) Tools The use of a set of graphical tools that provides users with multidimensional views of their data and allows them to analyze the data using simple windowing techniques Relational OLAP (ROLAP) – Traditional relational representation Multidimensional OLAP (MOLAP) – Cube structure OLAP Operations – Cube slicing–come up with 2-D view of data – Drill-down–going from summary to more detailed views – Roll-up – the opposite direction of drill-down – Reaggregation – rearrange the order of dimensions

Slicing a data cube

Example of drill-down Summary report Drill-down with color added Starting with summary data, users can obtain details for particular cells

Excel’s Pivot Table Insert/Pivot Table or Pivot Chart – Drill down, rollup and reaggregation – Filter Pivot Chart – Filter – Drilldown, rollup, reaggregation Import queries from Access to perform analysis.

Data Visualization Representing data in graphical/multimedia formats for analysis. – Web-based “dashboards” – Dashboard Samples

Chart

Charting Decision Rules An Internet Service Provider charges customers based on hours used: – First 10 hours$15 – Each of the next 20 hours$2 per hour – Hours over 30 hours$1 per hour

Comparing Decision Rules Plan 2: – First 20 hours: $20 – Hours over 20$1.5 Plan 3: – $35 unlimited access.

Charting Functions Demand function: – P = 150 – 6*Q ^2 Supply function: – P = 10* Q ^2 + 2*Q Note: – Positive area – Value axis maximum/minimum value: Format Value Axis

Chart Stock Market Data Download Dow Jones Historical Data – Yahoo/Finance/Dow Jones/Historical Data To chart: – Insert/Chart/Other Charts/Stock chart