Figure 10.14 shows the Individual Detail Report for PNP1 from the Semiconductor Capability.jmp sample data table as described in Example of the Process Capability Platform with Normal Variables.
Figure 10.14 Individual Detail Report
When you fit your process with a normal distribution, the Process Summary includes the Stability Ratio, which is a measure of stability of the process. The stability ratio is defined as follows:
Figure 10.15 shows the Individual Detail Report for Process 1 from the Process Measurements.jmp sample data table as described in Example of the Process Capability Platform with Nonnormal Variables.
Figure 10.15 Individual Detail Report for Process 1
The parameters and probability density functions for the normal, beta, exponential, gamma, Johnson, lognormal, and Weibull distributions are described in Capability Indices for Nonnormal Distributions: Percentile and Z-Score Methods. These are the same parameterizations used in the Distribution platform, with the exception that Process Capability does not support threshold parameters. See Distributions in the Basic Analysis book.
(Available when Nonparametric is selected as the distribution.) Shows or hides the Nonparametric Density report, which gives the kernel bandwidth used in fitting the nonparametric distribution. The kernel bandwidth is given by the following, where n is the number of observations and S is the uncorrected sample standard deviation:
Figure 10.16 shows the Compare Distributions report for Process 1 in the Process Measurements.jmp sample data table. The Selected distribution, which is Lognormal, is being compared to a Normal distribution. The Comparison Details report shows fit statistics for both distributions.
Figure 10.16 Compare Distributions with Probability Plot for Normal
For each distribution, gives AICc, BIC, and -2Loglikelihood values. See Likelihood, AICc, and BIC in the Fitting Linear Models book. (Not available for a Nonparametric fit.)
Shows or hides a report that displays probability plots for each parametric distribution that you fit. See Figure 10.16. An observation’s horizontal coordinate is its observed data value. An observation’s vertical coordinate is the value of the quantile of the fitted distribution for the observation’s rank. For the normal distribution, the overall estimate of sigma is used in determining the fitted distribution.
When possible, the intervals are computed by expressing the parametric distribution F as a location-scale family, so that F(y) = G(z), where z = (y - μ)/σ. The approximate standard error of the fitted location-scale component at a point is computed using the delta method. Using the standard error estimate, a Wald confidence interval for z is computed for each point. The confidence interval for the cumulative distribution function F is obtained by transforming the Wald interval using G. Note that, in some cases, special accommodations are required to provide appropriate intervals near the endpoints of the interval of process measurements.

Help created on 7/12/2018