proc stdrate gamma LowerCL

[Master_DiSASter]

Hi SASers,

I'm observing an irritating problem, using stdrate: I receive a missing value for LowerCL. 

The problem occurs only, when I ...:

• calculate DIRECTLY standardized rates
• using the GAMMA option to calculate confidence intervals
• if there are a lot of observed events (from different tests I would say, the problem starts to occur, when there are mor than 110'000 obserbved events)

Because the problem occurs only with a lot of events, I'm not able to provide sample data. The code looks like this:

ods exclude all;
proc stdrate 
data=work.ms_akut
refdata=work.resp 
     method=direct 
     cl=gamma 
     stat=rate(mult=1000)
;
population 
     event=obs_type 
     total=pop 
;
reference 
     total=pop_resp
;
strata sex age_class ;
by canton   
ods output StdRate=output_stdrate;
run;
ods exclude none;

Does anybody know this problem? Any explanation?

Any suggestions are very much appreciated....

Have a nice day,

Reto