[R-pkgs] survey package (3.18)

[Thomas Lumley]

Version 3.18 of the survey package is now percolating through CRAN.

Since the last announcement on this list, in February, the main additions are
  - standard errors for survival curves (both Kaplan-Meier and Cox model)
  - svyciprop() for confidence intervals on proportions, especially in small samples or near 0 or 1.
  - predictive margins by direct standardization, with marginpred()
  - two-phase subsampling designs can now have arbitrary multistage designs at each phase
  - Rao-Scott-type likelihood ratio tests are now available for glms and the Cox model
  - a wide range of options for PPS designs without replacement

There is also experimental support for parallel processing using the 'multicore' package.

         -thomas

Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle