Reliability and Survival Methods • Fit Parametric Survival • Fit Parametric Survival Options
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Fit Parametric Survival Options
The red triangle menu next to Parametric Survival Fit contains the following options:
Likelihood Ratio Tests
Produces tests that compare the log likelihood from the fitted model to one that removes each term from the model individually.
Wald Tests
Produces ChiSquare test statistics and p-values for Wald tests of whether each parameter is zero.
Likelihood Confidence Intervals
Specifies the type of confidence intervals shown in the Parameter Estimates table for each parameter. When this option is selected, a profile-likelihood confidence interval appears. Otherwise, a Wald interval is shown. In the report, the interval type is noted below the Parameter Estimates table. This option is on by default when the computational time for the profile-likelihood confidence intervals is not large.
Note: The alpha level can be modified from the launch window. 95% is the default setting.
Correlation of Estimates
Produces a correlation matrix for the model effects with each other and with the parameter of the fitting distribution.
Covariance of Estimates
Produces a covariance matrix for the model effects with each other and with the parameter of the fitting distribution.
Estimate Survival Probability
Specify regressor values and one or more time values. JMP then calculates the survival and failure probabilities with 95% confidence limits for all possible combinations of the entries.
Estimate Time Quantile
Specify regressor values and one or more survival values. JMP then calculates the time quantiles and 95% confidence limits for all possible combinations of the entries.
Note: For the Estimate Survival Probability and Estimate Time Quantile options, you can change the alpha level from the default of 95%.
Residual Plot
Shows a probability plot of the standardized residuals.
Save Residuals
Saves the residuals to a new column in the data table.
Distribution Profiler
Shows the response surfaces of the failure probability versus individual explanatory and response variables. See the Profilers book.
Quantile Profiler
Shows the response surfaces of the response variable versus the explanatory variable and the failure probability. See the Profilers book.
Distribution Plot by Level Combinations
Shows three probability plots for assessing model fit. The plots show different lines for each combination of the X levels.
Separate Location is a probability plot assuming equal scale parameters and separate location parameters. This is useful for assessing the parallelism assumption.
Separate Location and Scale is a probability plot assuming different scale and location parameters. This is useful for assessing if the distribution is adequate for the data. This plot is not shown for the Exponential distribution.
Regression is a probability plot for which the distribution parameters are functions of the X variables.
Save Probability Formula
Saves the estimated probability formula to a new column in the data table.
Save Quantile Formula
Saves the estimated quantile formula to a new column in the data table. Selecting this option displays a popup dialog, asking you to enter a probability value for the quantile of interest.
Model Dialog
Relaunches the launch window.
Effect Summary
Shows the interactive Effect Summary report that allows you to add or remove effects from the model. See the Effect Summary Report section in the Fitting Linear Models book.