Transcription of Process Capability Analysis and Process Analytical Technology
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Process Capability Analysis and Process Analytical Technology
Process Capability Analysis and Process Analytical TechnologyPresented by:Steven WalfishPresident, statistical Outsourcing Introduction to Capability What is Capability Histograms Normal Distribution Capability Indices Cp Cpk Pp Ppk Calculating Sigma Relating Capability to percent nonconforming Capability with attribute data Defects per Million Opportunities (DPMO) Process Analytical Technology (PAT)What is Capability ? Process Capability compares the output of an in-controlprocess to the specification limits. The comparison is made by forming the ratio of the spread between the Process specifications (the specification "width") to the spread of the Process values, as measured by Process standard deviation. A capableprocess is one where almost all the measurements fall inside the specification limits. Graphical = 75SD = = 73 USL = 776S = on each side of the mean to the specification ( ) 3S ( ) 2S ( ) 1S ( )Examples of Capability Some examples of where Capability Analysis can be used: Process that is not centered Process with large variability One-sided specifications Setting/confirming customer specificationsPercent Out of Specifications Based on the normal distribution, the percent of product that would
Short-Term • Statistical Process Control methods such as control charting provide estimates for short term variability. • Short term variability is defined as the average within subgroup
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