Process capability analysis
Discover the cutting edge in process capability analysis with the statgraphics six sigma and lean six sigma software learn more about our tools here. Capability analysis do you have continuous data or attribute data measures a characteristic of a part or process, such as length, weight, or temperature. Learn about how to perform a process capability study in our spc statistical process control knowledge center, written by author spc demystified. Chapter 6: process capability analysis for six sigma 3 this document contains explanation and examples on process capability analysis from. What is the relationship between process stability and process capability nothing and everything though they are not directly linked, statistician and spc expert steven wachs cautions that.
Chapter 1 process capability analysis in this chapter we give the mathematical background of process capability analysis, in particular the capability indices cp and cpk and related topics. Capability compares a process against its specification: process capability analysis entails comparing the performance of a process against its specifications. The six sigma - process capability study training module includes: 1 ms powerpoint presentation including 98 slides covering introduction to six sigma, creating and analyzing a histogram. A control chart analysis is used to determine whether the process is in statistical control if the process is not in statistical control then capability has no meaning therefore, the. The process capability is a measurable property of a process to the specification, expressed as a process capability index (eg, c pk or c pm) or as a process performance index a.
When performing process capability analysis, it's important to match your analysis to the distribution of your data but what if you're not so great with probability distributions, or you're. Process capability compares the output of an in-control process to the specification limits by using capability indices the comparison is made by forming the ratio of the spread between the. Process capability analysis using minitab (ii) by keith m bower, ms abstract this paper builds on the content covered in the previous edition of extraordinary. Process capability answers the question: is the process capable of meeting specifications specifications can be set by customers specifications could also be standards set by management.
Blog posts and articles about cpk, ppk, and other aspects of capability analysis methods used in lean and six sigma quality improvement projects. International journal of scientific & engineering research, volume 4, issue 7, july-2013 2472.
Process capability analysis
Cp and cpk are considered short-term potential capability measures for a process in six sigma we want to describe processes quality in terms of sigma. •comprehensive treatment of the subject with consistent theme of estimating percent of nonconforming product or service •treatment of both attribute and variable data in a unified manner.
Cpk is long term analysis and is continous process capability ig automotive industrie requires a ppk better than 1,67 and cpk better than 1,33 or ppk better than 2,0 and cpk better than. Process capability analysis is a major concept and a must study for professionals looking forward having a firm knowledge on minitab with statistics. How does it help process capability analysis is necessary to: •determine the area of focus which will ensure successful resolution of the project. Cp cpk template for excel you don't have to be a statistician to calculate cp and cpk just drop your data into qi macros fill in the blank template. Capability analysis what is it capability analysis is a set of calculations used to assess whether a system is statistically able to meet a set of specifications or requirements. Understanding process capability indices stefan steiner, bovas abraham and jock mackay institute for improvement of quality and productivity department of statistics and actuarial science.
Process capability & performance (pp, ppk, cp, cpk) are indicators of the specification relative to process dispersion and process centering, respectively six sigma study guide study notes. Process capability analysis to sum up, a process is capable when: it is under statistical control it has a low variability rate compared to the range of speci ed limits. International journal of pharmaceutical and life sciences issn 2305-0330 volume 2, issue 2: march 2013 page 85 process capability analysis in pharmaceutical production. Process capability is a measure obtained by taking a representative sample of process output, performing a statistical analysis and using the results obtained to determine future expected. Object: a 'qcc' object of type xbar speclimits: a vector specifying the lower and upper specification limits target: a value specifying the target of the process.