Understanding Society User Support

Hello,

I've been looking at the time 1 youth completion data. When I attempt to adjust for the design using SVYSET i'm warned that there are numerous instances of strata containing only a single PSU. I assume this is due to the youth completion data representing a subsample of the overall dataset? I understand that STATA 10 has further svyset options for dealing with singleton PSUs, but I do not have access to this version. I was wondering about ignoring strata when using svyset (e.g., assuming all psu belong to the same stata) but i'm uncertain about the degree of bias this would incur. Advice around this or other approaches to managing this singleton PSU issue would be appreciated. Thank you for your time.