Quick Answer: What Does 1.33 CPK Mean?

Can CPK be negative?

Yes, it is possible for Cpk and Ppk to be negative.

It is impossible to have a standard deviation be negative so that would mean that x(bar) was larger that the Specification Limit.

In other words, the process average is out of specification..

What does CPK test for?

When a muscle is damaged, CPK leaks into the bloodstream. Finding which specific form of CPK is high helps determine which tissue has been damaged. This test may be used to: Diagnose heart attack.

What is CP CPK?

Cp and Cpk, commonly referred to as process capability indices, are used to define the ability of a process to produce a product that meets requirements. … Specifications: Specifications define product requirements. In other words, they define what is expected from an item for it to be usable.

What is the maximum Cpk value?

1.0The minimum value of “k” is 0 and the maximum is 1.0. A perfectly centered process will have Cp = Cpk. Both Cpk and Ppk relate the standard deviation and centering of the process about the midpoint to the allowable tolerance specifications.

What are the symptoms of high CPK levels?

Cardiac symptoms that may occur along with elevated creatine kinaseChest pain or pressure.Difficulty breathing.Lightheadedness or dizziness.Pain that radiates to the jaw or down the arm.Profuse sweating.Rapid heart rate (tachycardia)

Why Six Sigma means 3.4 defects?

The objective of Six Sigma quality is to reduce process output variation so that on a long term basis, which is the customer’s aggregate experience with our process over time, this will result in no more than 3.4 defect parts per million (PPM) opportunities (or 3.4 defects per million opportunities – DPMO).

What is an acceptable ppm?

Definition: One PPM means one (defect or event) in a million or 1/1,000,000. In the past a good supplier would have a defect rate of less than 1%, (10,000 PPM). However, production and quality control procedures have improved and expectation was increased to 0.1% or 1,000 PPM.

What is a good Cpk value?

Notes on Cpk When Cpk is negative it means that a process will produce output that is outside the customer specification limits. We generally want a Cpk of at least 1.33 [4 sigma] or higher to satisfy most customers. Cpk can have an upper and lower value reported.

What is the PPM for 1.33 CPK?

Sigma level tableTwo sided tableCpk PpkSigma levelPPM out of tolerance1.173.5465.2581.334.063.3421.504.56.7958 more rows

What is CPK formula?

Cpk is a process capability index used to measure what a process is capable of producing. … Cpk requires the assumption that the measurements are normally distributed. The formula for the calculation of Cpk is Cpk = min(USL – μ, μ – LSL) / (3σ) where USL and LSL are the upper and lower specification limits, respectively.

What does a Cp of 1.5 mean?

greater than oneA Cp of greater than one indicates that the process spread is less than the width of the specification. Potentially this means that the process can fit inside the specification limits. … So a Cp of 1.5 means the process can fit inside the specification 1.5 times.

What does a Cpk of 0 mean?

. #2. Cpk of 0 would only be possible if the process was run exactly on either the upper or lower spec. limit. This would assume there was no variation in the process what so ever.

What is PPK vs CPK?

So the key takeaway is that Cpk is the potential of a process to meet a specification (short term) while Ppk is how the process actually did (long term). Another way to look at the difference is that Cpk is used for a subgroup of data, while Ppk is used for the whole process.

How many Sigma is 1.67 Cpk?

6 sigmaCp = Cpk = 1.67. The sigma level is now 5 – the specifications are five standard deviations away from the average. The out of specification has decreased to 0.57 ppm. The fourth curve represents that magical 6 sigma level.

What does a Cpk of 2.0 mean?

process capability indexThe process capability index, or Cpk, measures a process’s ability to create product within specification limits. … When the Cpk is greater than or equal to one, the process is considered capable of producing a product within specification limits. In a Six Sigma process, the Cpk equals 2.0.

How do I get my CPK levels down?

Talk to your doctor about ways to help lower your creatinine levels, including these eight natural options:Cut back on vigorous exercise. … Don’t take supplements containing creatine. … Reduce your protein intake. … Eat more fiber. … Talk to your doctor about how much fluid you should drink. … Try chitosan supplements. … Take WH30+More items…

What does a Cpk of 1.67 mean?

Excellent, CapableThe outcome of a Process Capability study is a single metric, which provides an indication of the ability of a process to consistently provide output which is within required specifications. CPK <1.00 (Poor, incapable) 1.00< CPK <1.67 (Fair) CPK >1.67 (Excellent, Capable)

What diseases cause elevated CPK?

High CPK levels may be seen in people who have:Brain injury or stroke.Convulsions.Delirium tremens.Dermatomyositis or polymyositis.Electric shock.Heart attack.Inflammation of the heart muscle (myocarditis)Lung tissue death (pulmonary infarction)More items…