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Using Graphs for Information Extraction
Gasoline Consumption Example
Jan 12, 2010 STAT 100 1
Jan 12, 2010 STAT 100 2
Gasoline Consumption
Each Fill - record kms and litres of fuel used
Smooth--->SeasonalPattern
Jan 12, 2010 STAT 100 3
Theory of Smoothing
Smoothing amplifies signal but introduces bias
by cutting off peaks and valleys
Jan 12, 2010 STAT 100 4
Illustration of Effect – Artificial Data
Jan 12, 2010 STAT 100 5
Intro to smoothing with context …
Jan 12, 2010 STAT 100 6
Suggests follow-up
1. How do you choose the amount of smoothing to produce useful information?
2. Why does a seasonal pattern occur?