Distribution

For Intervention and Disposition reports:

For AE Time to Event:

This option can be different for different reports.

For Intervention and Disposition reports:

Check this option to include a distribution for either Interventions or Disposition data.

To Specify This Option:

Click within the check box.

For AE Time to Event:

Use this option to choose the distribution the event counts are assumed to follow.

Negative binomial fits an extra parameter k that can account for over-dispersion.

Note: This option is available only when the Response Type is an incidence density.

To Specify the Distribution:

Make sure that either Incidence density based on first event only or Incidence density based on all events is specified as the Response Type.

Click within the radio button for the desired distribution.

Note: If s you see errors regarding NEWRAP convergence in the SAS log after you run an ANOVA report with Negative Binomial selected, you should consider either switching to a Poisson distribution or increasing the value specified in the Gradient Convergence Criterion. This will effectively reduce the restrictive criterion and help you avoid this convergence error.