Producing Taguchi linear graphs
Overview
This standard covers the competencies required for producing Taguchi linear graphs. It involves utilising sample size selection to ensure the statistical validity of the experiment and calculating the correct sample size for the experiment. You will need to produce and use suitable sampling plans to reduce systematic errors and estimate the resources and expected benefits from carrying out the Taguchi linear graph activity. You will need to choose the appropriate Taguchi linear graph to use and calculate the factor settings for the Taguchi linear graph experiment. Having gathered all the necessary information and completed the appropriate calculations you will need to run an experiment and analyse the data collected for main effects and interactions. You will be required to identify suitable optimum conditions and produce a report of the activities, which includes and action plan of how the improvements can be implemented.
Your responsibilities will require you to comply with organisational policy and procedures for the activities undertaken and to report any problems with the activities that you cannot solve or are outside your responsibility to the relevant authority. You will need to ensure that all the necessary documentation and calculations are completed accurately and legibly. You will be expected to take full responsibility for your own actions within the activity and for the quality and accuracy of the work that you produce.
Your underpinning knowledge will provide a good understanding of Taguchi linear graphs and provide an informed approach to the techniques and procedures used. You will need to understand the principles and application of Taguchi linear graphs in adequate depth to provide a sound basis for carrying out the activities to the required criteria.
Applying safe working practices will be a key issue throughout.
Performance criteria
You must be able to:
- work safely at all times, complying with health and safety and other relevant regulations, directives and guidelines
- utilise sample size selection to ensure the statistical validity of the experiment and calculate the correct sample size for the experiment
- identify suitable sampling plans to reduce systematic errors
- estimate the resources and expected benefits from the Taguchi linear graph activity and gain approval
- determine the correct Taguchi linear graph to use
- calculate factor settings for the Taguchi linear graph experiment
- determine factors and levels for the design of experiment
- run an experiment and analyse and record the data collected
- identify suitable optimum conditions and create an action plan to ensure these conditions are implemented
- complete a Taguchi linear graph report
Knowledge and Understanding
You need to know and understand:
- how to work safely at all times, complying with health and safety and other relevant regulations and guidelines
- what is meant by the following terms: fold over, confounded, alias
- how to produce Taguchi linear graph designs for a range of arrays
- what is meant by Alpha risk and Beta risk
- what are a population and a sample
- how to calculate a suitable sample size
- why we need to use Taguchi linear graph experimental design and how it is used in a Six Sigma improvement project
- how to conduct a Taguchi linear graph experiment
- how to calculate mean, median, mode, standard deviation, range and variance
- how to calculate and graphically display main effects and interactions
- how to identify suitable optimal conditions
- how to create an action plan to ensure that improvements are implemented
- how to create a Taguchi linear graph report, and the information is should contain
- the extent of your own authority and whom you should report to, in the event of problems that you cannot resolve
Scope/range
Scope Performance
Determine for the Taguchi linear graph experiment all of the following:
- a suitable Alpha risk level
- a suitable Beta level
- a suitable Delta that needs to be observed
Calculate and produce graphs for both the following:
- main effects
- interactions
Document the resources required to include:
- financial
- time scales
- manpower
- plant/equipment
- materials