WesVar – Replication-based approach to Surveys

Complex Surveys often require analysis techniques based on what is known as “Design Based” methods. This is a special branch of Statistics concerned with finite populations and complex survey designs with supporting estimation methods. Options to address this area of survey tools can be found in commerical packages such as SUDAAN, SAS, SPSS, STATA and others to varying degree. WesVar overlaps these options and offers jackknife and balanced repeated replication(BRR)methods to estimate variances of survey estimates. These methods correctly account for the effects of multistage complex survey designs with stratifed and unequal selection probabilities. For more information see:
http://www.westat.com/westat/wesvar/about/index.html