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Showing posts from January, 2020

Pareto analysis (80/20 Rules)

Pareto analysis (80/20 Rules) Pareto analysis introduced by an Italian economist Wilfredo Pareto who worked with income and other unequal distributions in 19th century. He noticed that 80% of the wealth was owned by only 20% of the population which means the majority of the defects are caused by a few defective items. Later Pareto principle was developed by Japan in 1950. A Pareto chart is a special type of histogram that can easily be applied to find and prioritize quality problems conditions are their causes of in the organization. Pareto charts are a type of bar charts unless the horizontal axis represents categories of interest rather than a continuous scale the categories are often defects. Pareto charts can help to focus improvement on areas. The Pareto chart is very important part of the seven basic tools of quality control , is type of chart that contains both Mars and a line graph. Where individual values,  bar are represented in descending order, and the accumulat

Histogram in Quality Control

Histogram in Quality Control What is histogram? Histogram is a spc technique. It is graphical tool that represent the data values with the help of vertical rectangular bar. Height of the bars is corresponding to the frequency of the data values. A frequency distribution shows different value in data occurs A Histogram most commonly used graph to show frequency distribution. It looks very much like a bar chart, but there is important difference between them. Why does the histogram use as a QC tool? Showcases the large amount of data using vertical bars, It is help in analysis the properties of data in statistical process control such as. Distribution of the data Spread of the data Variation in the process Skewness of the data Help summaries data from process that has been collected over a period of time. Help graphically represent data frequency distribution in bar chart . What does it to do? Reveals centering, variable and underlying distribution

Control Charts-7 QC Tools

Control Charts-7 QC Tools Control Charts used for M Chart & R Chart, P & C-Chart and X-Bar Charts. What is a control chart? Control chart signifies the provision when data goes beyond control limit and inspires the process owner to identify the assignable causes of the variation in the process to take immediate corrective action to control the process. Why does control chart use as a QC tools? A defect as a result of process variation and variation comes in the process because of assignable and common causes. When data goes beyond control limits. It is because of assignable or special causes and it requires immediate corrective action to maintain the process within control limits. Hence to maintain the process variation within control limits process owner requires a control chart.             X-Bar Table:         X-Bar Chart:           Types of control chart. There are two types of control charts. 1) Control charts for variables suc