Six Sigma projects often deal with experiments whose outcomes are ordered categorical data, rather than continuous. It is important to know the right analysis methods for these cases, such as Jeng and Guos weighted probability-scoring scheme (WPSS).
A medical devices company launched a substrate development effort using DFSS and DOE to predict the stress caused by the laser welding process and ensure product reliability.
When DOE is used for software testing, there is a large amount of savings in testing time and cost. Use of orthogonal array based testing has demonstrated to produce superior test plans that improve testing productivity by a factor of 2.
Design of experiments (DOE) is one of those specialized and sophisticated tools you should have in your toolbox. It is a technique to optimize any process or product better, faster and cheaper than other optimization methods, including A/B testing (also known as OFAT or one-factor-at-a-time) and "expert" guessing.
Understanding the terms and concepts that are part of a DOE can help practitioners be better prepared to use the statistical tool.
DOE, known in marketing as conjoint analysis, is a powerful statistical technique for seeing connections between a customer's decision-making process and a product or service. It allows a company insight into what a customer is influenced to buy.
In the development phase of DFSS, practitioners frequently deal with experiments to determine optimal ingredient mixtures for desired products. An example from the medical device industry helps outline these experiments in a step-by-step process.
When it comes to mastering design of experiments (DOE), many experience a steep learning curve. To fully understand and apply DOE, quality professionals need to learn when to use it, how to set up the experimental design and how to interpret results.
While statistical approaches to software testing like DOE do hold promise, those who use them need to understand them in a balanced way looking for where they do and do not fit. Test designers also should understand some of risks involved.
Each step of the DMAIC methodology brings a distinct set of tools to bear on the project objective. For the Analyze and Improve phases, design of experiments (DOE), combined with analysis of variance, is the Six Sigma "power tool."
Design of experiments (DOE) is an important tool for driving improvement. Through simulations used in training, new Belts can get hands-on experience while learning the challenges of DOE before they apply it to costly real-world experiments.
Test plans, which outline requirements, activities, resources, documentation and schedules, are an important part of performing an experiment. They save time and money, help get the best results and facilitate speedy test report writing.
For purposes of learning, using, or teaching design of experiments (DOE), one can argue that an eight run array is the most practical and universally applicable array that can be chosen. There are several forms of and names given to the various types of these eight run arrays (e.g., 2^3 Full Factorial, Taguchi L8, 2^4-1 Half Fraction, Plackett-Burman 8-run, etc.), but they are all very similar.
The objective of a design of experiments is to optimize the value of a response variable by changing the values of the factors that affect the response. This article explains how to analyze an attribute type of response (e.g., pass/fail, accept/reject, etc.).
As a result of doing systematic experimentation, using sound statistical principles, the quality of processes can be improved and become more robust to variations in the levels of components and processing factors. Apply powerful design of experiments (DOE) tools to make your system more robust to variations in component levels and processing factors.
Applying powerful design of experiments (DOE) tools to make your system more robust to variations in component levels and processing factors, as evidenced by this case study involving the improvement of a paraffin therapy bath product.
The underused DOE tool can be valuable to financial services businesses when they realize the reason it is a favorite in general business environments: It is an extremely efficient way of identifying what matters in a process and what does not.
Design of experiments is a key tool in the Six Sigma methodology because it effectively explores the cause and effect relationship between numerous process variables and the output. Fractional factorial designs are good alternatives to a full factorial design, especially in the initial screening stage of a project.
Teaching DOE to DFSS trainees offers challenges on how best to transfer knowledge. Needed are constant and accurate results in examples used, reasonable material costs and instructional techniques to keep class interest. Solution: A toy motorcycle.
Three young men, each being infatuated with the same woman, agree to conduct a design of experiment of love. Statistics and romance intertwine in this entertaining and educational real-life story. Which bachelor will end up with the young lady's hand? Will the design of experiment prove successful?
Plackett-Burman experimental designs are used to identify the most important factors early in the experimentation phase when complete knowledge about the system is usually unavailable. They allow practitioners to screen for the important factors that influence process output measures or product quality, using as few experimental runs as possible.