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Showing results for tags 'control chart'.
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Z-MR Short Run Chart
Vishwadeep Khatri posted a question in We ask and you answer! The best answer wins!
Q 566. Domino's promises delivery of pizza within 20 minutes. It is tracking the delivery time of each order to check the stability of the process. Each order is different with respect to items ordered, delivery location etc. The team has suggested to use either the Individual Moving Range (I-MR) or Z-MR (Standardized Individual Moving Range) control chart. Which control chart is more suitable here given that each order is different from the previous one? Why do you think it is more suitable? Note for website visitors - This platform hosts two questions per week, one on Tuesday and the other on Friday. All previous questions can be found here: https://www.benchmarksixsigma.com/forum/lean-six-sigma-business-excellence-questions/. To participate in the current question, please visit the forum homepage at https://www.benchmarksixsigma.com/forum/. The question will be open until the following Tuesday or Friday evening at 5 PM Indian Standard Time, depending on the launch day. Responses will not be visible until they are reviewed, and only non-plagiarised answers with less than 5-10% plagiarism will be approved. If you are unsure about plagiarism, please check your answer using a plagiarism checker tool such as https://smallseotools.com/plagiarism-checker/ before submitting. All correct answers shall be published, and the top-rated answer will be displayed first. The author will receive an honourable mention in our Business Excellence dictionary at https://www.benchmarksixsigma.com/forum/business-excellence-dictionary-glossary/ along with the related term. Some people seem to be using ChatGPT to find forum answers. This is a risky approach as ChatGPT is error prone as our questions are application questions (they are never straightforward). Have a look at this funny example - https://www.benchmarksixsigma.com/forum/topic/39458-using-ai-to-respond-to-forum-questions/ -
Xbar S chart often used control chart to analyze the process mean and standarad deviation over time. This chart is used when the subgroup size is more than 10. The S chart provides a better understanding of the spread of data as compare to the range. X bar S Control Chart definitions X Bar: The mean varies in the process over time from subgroup values. The mean and standarda deviation is used to calculate the control limits. S Chart: This represents the standard deviation of the process over time from mean of subgroups value. This monitors the process standard deviation. -
Tests for Special Causes
Vishwadeep Khatri posted a question in We ask and you answer! The best answer wins!
Q 524. What is the difference between the various set of tests for detection of special causes - Nelson, Montgomery, Western Electric, Westgard? What is the criteria to use these different set of rules? Illustrate your answers with examples. Note for website visitors - Two questions are asked every week on this platform. One on Tuesday and the other on Friday. All questions so far can be seen here - https://www.benchmarksixsigma.com/forum/lean-six-sigma-business-excellence-questions/ Please visit the forum home page at https://www.benchmarksixsigma.com/forum/ to respond to the latest question open till the next Tuesday/ Friday evening 5 PM as per Indian Standard Time. Questions launched on Tuesdays are open till Friday and questions launched on Friday are open till Tuesday. When you respond to this question, your answer will not be visible till it is reviewed. Only non-plagiarised (plagiarism below 5-10%) responses will be approved. If you have doubts about plagiarism, please check your answer with a plagiarism checker tool like https://smallseotools.com/plagiarism-checker/ before submitting. The best answer is always shown at the top among responses and the author finds honorable mention in our Business Excellence dictionary at https://www.benchmarksixsigma.com/forum/business-excellence-dictionary-glossary/ along with the related term -
Run Charts vs Control Charts
Vishwadeep Khatri posted a question in We ask and you answer! The best answer wins!
Q. 111 Explain the four terms with respect to Run Charts - Mixtures, Clusters, Oscillations and Trends. Does a run chart provide any advantage as compared to a control chart? Note for website visitors - Two questions are asked every week on this platform. One on Tuesday and the other on Friday. All questions so far can be seen here - https://www.benchmarksixsigma.com/forum/lean-six-sigma-business-excellence-questions/ Please visit the forum home page at https://www.benchmarksixsigma.com/forum/ to respond to the latest question open till the next Tuesday/ Friday evening as per Indian Standard Time. The best answer is always shown at the top among responses and the author finds honorable mention in our Business Excellence dictionary at https://www.benchmarksixsigma.com/forum/business-excellence-dictionary-glossary/ along with the related term. -
Pre-Control Charts
Vishwadeep Khatri posted a question in We ask and you answer! The best answer wins!
Q. 92 What are pre-control charts and how are they different from control charts? Highlight the construction, advantages, disadvantages and applications of the same. Note for website visitors - Two questions are asked every week on this platform. One on Tuesday and the other on Friday. All questions so far can be seen here - https://www.benchmarksixsigma.com/forum/lean-six-sigma-business-excellence-questions/ Please visit the forum home page at https://www.benchmarksixsigma.com/forum/ to respond to the latest question open till the next Tuesday/ Friday evening as per Indian Standard Time. The best answer is always shown at the top among responses and the author finds honorable mention in our Business Excellence dictionary at https://www.benchmarksixsigma.com/forum/business-excellence-dictionary-glossary/ along with the related term. -
I am running a project for transportation.. I have to reduce the transportation cost. I have a baseline created with % of freight spent to sales value. The problem is multiple location and multiple mode of transport and multiple product lines that affects the weight and utilization factor. Thus I have taken grouping as months, since these variables are there every month. Thus X bar chart was drawn for the baseline than using a I MR chart with individual data points. I have close to 50 data pts per month.. Thus I MR goes out of control limits but x bar S chart is within limits.. Is this the rt way to proceed.