Minitab control chart4/4/2023 Accordingly, the single-stage analysis gives a complete picture of how the infection rate is changing overall, whereas the multistage analysis is more sensitive to small changes. We also recommend analyzing the data points in both single-stage and multistage analyses in accordance with this new perspective rather than the traditional one used in process improvement projects. Comparing the performance of different tests in detecting changes in the IR, one can see that no particular test outperformed the others in all cases. Comparing the Laney p' control chart with the EWMA control chart, the data showed that in most cases, the Laney p' control chart was able to identify the change of IR faster. In addition, we analyze the performance of various test rules in detecting IR changes. In this study, we use the Laney p' control chart to monitor the COVID-19 IR and compare its performance with that of the EWMA control chart. Regardless, the analysis shows cases where using test rules rapidly detected patterns and changes in IR, and allowing remedial action to be taken without delay. Typically, test signals are considered as an indication of a change in a process, although in some situations we have observed that slight changes are not accompanied by a signal. The restrictive measures proved to be effective in decreasing the infection rate, whereas relaxing these measures had the opposite effect. The charts thereby allowed us to study the effects on infection rates of the government's moves to restrict the movements and activities of the population, as well as the results of easing these restrictions. The IR data were subsequently plotted on the Laney p' control charts using the Minitab software. The IR was calculated by dividing the number of confirmed cases by the number of PCR (polymerase chain reaction) tests performed. Data for the infection rate (IR) were collected between October 31, 2020, and March 19, 2022. This may be the easiest way to create Excel-based SPC charts that you update every month or week.īut it's up to you.In this research, we examine the use of the Laney p' control chart and the application of test rules to assess governmental interventions throughout the COVID-19 pandemic and understand how certain activities and events that took place affected the infection rate. Decrease the time required for statistical analysis by learning how to navigate through Minitab 21’s user-friendly environment. Just drop your data directly into the yellow input area and the chart is created to the right. Only the QI Macros has Excel templates for each chart. For 50 years, Minitab has been the leading software for data analysis and quality improvement. Just select your data and click on the Wizard! Harness your processes with Minitab in real-time. That's why the QI Macros have a Chart Wizard and a Control Chart Wizard to choose the right chart automatically. How do I select my data? What column do I select to do what? QI Macros Chart WizardsĪnd the beginning SPC user struggles before they begin with choosing the right chart. Most people find Minitab's® step 4 confusing. And, as we know from Lean, extra steps mean additional chance for error and more importantly: delay. Select the stability rules to apply and click OK:Īs you can see, there are a number of additional steps required to achieve the same result. Select the columns of data to be included in the chartĥ. Click on the Minitab® menu and select theĤ.
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