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Using Graphs for Information Extraction Gasoline Consumption Example Jan 12, 2010STAT 1001.

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Presentation on theme: "Using Graphs for Information Extraction Gasoline Consumption Example Jan 12, 2010STAT 1001."— Presentation transcript:

1 Using Graphs for Information Extraction Gasoline Consumption Example Jan 12, 2010STAT 1001

2 Jan 12, 2010STAT 1002 Gasoline Consumption Each Fill - record kms and litres of fuel used Smooth ---> Seasonal Pattern

3 Jan 12, 2010STAT 1003 Theory of Smoothing Smoothing amplifies signal but introduces bias by cutting off peaks and valleys

4 Jan 12, 2010STAT 1004 Illustration of Effect – Artificial Data

5 Jan 12, 2010STAT 1005 Intro to smoothing with context …

6 Jan 12, 2010STAT 1006 Suggests follow-up  1. How do you choose the amount of smoothing to produce useful information?  2. Why does a seasonal pattern occur?  1. How do you choose the amount of smoothing to produce useful information?  2. Why does a seasonal pattern occur?

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