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Attribute Control Charts in Health Care

The p, np, c and u control charts are called attribute control charts. These four control charts are used when you have “count” data. There are two basic types of … See more

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Laney p’ Control Chart

WEBThis publication introduced the Laney p’ control chart. This control chart is very useful in handling large subgroup sizes that lead to very narrow limits on the traditional p control …

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The Purpose of Control Charts

WEBThat process variable can be plotted on a control chart over time. The objective of the control chart is to find any “special” causes of variation as well as to reflect the process …

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u Control Charts

WEBYou decide to make your inspection unit 1000 days. So, the u control chart will be monitoring the number of infections per 1000 device-days. Using the data above, the …

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Dr. W. Edwards Deming and Profound Knowledge – Part 1

WEBThe first part of this profound knowledge is understanding what a system is. Dr. Deming defines a system as “an interconnected complex of functionally related components that …

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SPC and Pharmaceutical In-Process Control – SPC for Excel

WEBThe X chart indicates that overall variability of the process is within the control limits with the exception of one result. The mean of sample 7 is above the upper control limit. By …

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My Blood Pressure is What

WEBThis is what the top number is measuring. A normal systolic blood pressure is below 120. The bottom number is a measure of the pressure in the arteries between heart beats – …

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An Example of the Misuse of SPC in Health Care – SPC

WEBYes, it does. And this is a perfect example of how using the wrong type of control chart leads to the wrong conclusions. The author uses a c control chart when it doesn’t apply. …

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Hypothesis Testing

WEBThe team will go through the basic five steps of hypothesis testing: Formulate the null hypothesis and the alternative hypothesis. Determine the significance level. Collect the …

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How Many Samples Do I Need

WEBIt requires 14 samples to detect a difference of 0.15 with a power of 80% and 19 samples for a power of 90%. To detect a difference of 0.05 at 80% power requires 126 samples …

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COVID-19 Data: Does a Control Chart Add Anything to Analysis

WEBA control chart, after all, is best suited for analyzing data from one process with clear operational definitions. This is not the case with COVID-19 data. These data are coming …

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How to Mess Up Using Control Charts

WEBThe issue is that the person putting the control chart together doesn’t understand how a control chart works. You get the pattern above sometimes with the X-R chart.This type …

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Monitoring Customer Complaints Using SPC – SPC for Excel

WEBThese data can be tracked easily in a Microsoft Excel spreadsheet. Microsoft Access can also be used. In addition, there are numerous customer complaint tracking software …

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SPC and Global Warming: 1880 – 2021

WEBThis publication continued our look at global warming by including the 2021 data. The model from our previous publication had predicted an annual global temperature deviation in …

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SPC Knowledge Base

WEBThe best way to know if a metric is changing is to examine the data over time using time-series charts. A ten-step process to implement metrics is also presented. (Download …

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SPC and Industries BPI Consulting

WEBSPC for Excel Software is used by organizations in all industries. See below for a partial list of clients and industries: Universities and Colleges American College of Surgeons …

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SPC and Global Warming: 1880 – 2022

WEBAnnual Global Temperature Deviation = -39.271 + 0.0199 (2023) = 0.97. This analysis then predicts that the average global temperature for 2023 will be 0.97 °C above the baseline. …

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SPC Knowledge Base

WEBAt the heart of Process Management is a five-step method that is applied to each primary process: define, document, measure, manage and improve. The model represents a …

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