BookmarkSubscribeRSS Feed
LucyB
Obsidian | Level 7

I have an outcome frequency over a variable number of years per patient. I have converted this to a rate per year and would like to investigate differences bet a certain category. The rates are overdispersed and zero inflated. How can I code a zero inflated negative binomial model in SAS for this rate outcome?

3 REPLIES 3
LucyB
Obsidian | Level 7

what about countreg?

 

e.g:

proc countreg data=data;
    model rate = category covariate / dist=zinb method=qn;
    zeromodel rate ~ category covariate;
run;

 

 

I was not sure how to model the zeromodel..

Ksharp
Super User

I don't know PROC COUNTREG is under SAS/ETS, it is for time series.

sas-innovate-2024.png

Join us for SAS Innovate April 16-19 at the Aria in Las Vegas. Bring the team and save big with our group pricing for a limited time only.

Pre-conference courses and tutorials are filling up fast and are always a sellout. Register today to reserve your seat.

 

Register now!

What is ANOVA?

ANOVA, or Analysis Of Variance, is used to compare the averages or means of two or more populations to better understand how they differ. Watch this tutorial for more.

Find more tutorials on the SAS Users YouTube channel.

Discussion stats
  • 3 replies
  • 1231 views
  • 0 likes
  • 2 in conversation