Covariate Srch Shotgun

The Covariate Srch. Shotgun (shotgun covariate search) run mode option is only available for Population models. Covariates and covariate effects must be specified. This run mode performs a shotgun search to evaluate all the possible scenarios and selects the best one out of 2^(number of effects). Each possible effect that is added has the effect of doubling the number of scenarios. It creates a list of evaluated scenarios.

In the Model Executor window, select the Covariate Srch Shotgun from the Run Mode pulldown.

The options are the same as those for the Covariate Srch Stepwise mode.

Covariate Shotgun searches only generate the Overall worksheet as an output worksheet. To generate the full results, change the Run Mode to Scenarios and re-execute. Since the best scenario (based on the criterion -2LL, AIC, or BIC) is selected automatically after the covariate search, it will be used during the Scenarios run. The selected scenario is also used for any subsequent Simple runs.