Читать книгу Design for Excellence in Electronics Manufacturing - Cheryl Tulkoff - Страница 41

Variation statistics that most are familiar with are those for central tendency, which include the mean, median, and mode. Dispersion/spread statistics include range, variance, standard deviation, skewness, and kurtosis. The cumulative distribution function provides the probability that a measured value falls between to +. The reliability function provides the probability that an item will survive for a given interval. The hazard function provides the conditional probability of failure in a range given that there was no failure by a certain value (time). A higher failure rate gives rise to a greater probability of impending failure. This is also called the instantaneous failure rate.