Example of Fractional Factorial
Presented by:
Juanito S. Chan, PIE
Weed-Whacker Experiment
• A weed whacker is a grass trimmer that runs
on a mixture of gasoline and oil one-cylinder
engine...
Weed-Whacker Experiment…
• Before starting the engine, you must first give
the primer several pumps, choke the air
intake,...
Factors for weed-whacker experiment
Factor Name Low Level (−) High Level (+)
A Prime pumps 3 5
B Pulls at full choke 3 5
C...
Std A B C D E Pulls
1 − − − − + 1
2 + − − − − 4
3 − + − − − 4
4 + + − − + 2
5 − − + − − 8
6 + − + − + 2
7 − + + − + 3
8 + ...
Problem
• Determine which factors are significant for
minimizing pulls in weed whacker.
• Give your recommendation.
Final Recommendation
The ideal procedure for minimizing pulls is:
• Prepare engine with three primer pumps and
three pulls...
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Example of fractional factorial

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Example of fractional factorial

  1. 1. Example of Fractional Factorial Presented by: Juanito S. Chan, PIE
  2. 2. Weed-Whacker Experiment • A weed whacker is a grass trimmer that runs on a mixture of gasoline and oil one-cylinder engine. • The weed whacker engine features a manual starter (pull cord), and its performance is largely a function of three controls: primer pump, choke, and gas.
  3. 3. Weed-Whacker Experiment… • Before starting the engine, you must first give the primer several pumps, choke the air intake, and pull the starter cord several times. • To start the engine, the choke must be open.
  4. 4. Factors for weed-whacker experiment Factor Name Low Level (−) High Level (+) A Prime pumps 3 5 B Pulls at full choke 3 5 C Gas during full choke pulls 0 100% D Final choke setting 0 50% E Gas for start 0 100%
  5. 5. Std A B C D E Pulls 1 − − − − + 1 2 + − − − − 4 3 − + − − − 4 4 + + − − + 2 5 − − + − − 8 6 + − + − + 2 7 − + + − + 3 8 + + + − − 5 9 − − − + − 3 10 + − − + + 1 11 − + − + + 3 12 + + − + − 4 13 − − + + + 3 14 + − + + − 4 15 − + + + − 6 16 + + + + + 5
  6. 6. Problem • Determine which factors are significant for minimizing pulls in weed whacker. • Give your recommendation.
  7. 7. Final Recommendation The ideal procedure for minimizing pulls is: • Prepare engine with three primer pumps and three pulls at 100% choke with 0% gas. • Start at 0% choke at 100% gas.
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