P-Chart by PQ Systems

avtor: PQ Systems

Prenesite vzorecNavodila

An SPC chart for analyzing process behavior of data collected in proportions or percentages.

A p-chart is an attributes control chart used with data collected in subgroups of varying sizes. Because the subgroup size can vary, it shows a proportion on nonconforming items rather than the actual count. P-charts show how the process changes over time. The process attribute (or characteristic) is always described in a yes/no, pass/fail, go/no go form. For example, use a p-chart to plot the proportion of incomplete insurance claim forms received weekly. The subgroup would vary, depending on the total number of claims each week. P-charts are used to determine if the process is stable and predictable, as well as to monitor the effects of process improvement theories. A p-chart should be used instead of a u-chart when the result is expressed in a proportion. For example, the number of items found to be defective during an inspection. A u-chart shows process changes over time by looking at the number of nonconformities produced by the process. The plotted values represent a ratio. The subgroup size can vary, so control limits can adjust to reflect this, just as p-charts do. Another guideline: If the items being counted can never be larger than the item being inspected, a p-chart is recommended. For example, if you are inspecting a dozen labels, at most 12 can have a missing label. When to use classification (attributes) control charts: 1. When you want to see if your process is stable and predictable; 2. When you want to see how a planned change affects the process; 3. When the data you are examining represents counts of some type; 4. When the time order of the data is preserved. This chart is part of PI VIZpack™ by PQ Systems, a collection of eight process improvement charts for Power BI®. They provide a clear way to visualize and evaluate process behavior and performance. Get started with a free two-week trial today. After the trial, you may continue using the basic features or upgrade to the premium version. To learn more visit our website.

Zmogljivosti ponazoritve

Ko je ta ponazoritev v uporabi, lahko
  • Lahko dostopa do zunanjih storitev ali virov

Hiter pregled