VPLX: VARIANCE ESTIMATES FOR COMPLEX SAMPLES
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VPLX is a portable FORTRAN program in the public domain to estimate variances, covariances, and related statistics for complex samples through replication methods. The software has been designed particularly to address applications within the Census Bureau and by users of the Census Bureau's public use files, but the general nature of the program should make it of interest to many other survey researchers. VPLX accommodates variance calculations through replicate weights or factors, or through survey identifiers such as stratum, PSU, and secondary sampling unit. The user-oriented command language is similar in many respects to SPSS and SAS. The paper summarizes key features and future enhancements.