Writes the imptuted datasets to file from a run of amelia.
write.amelia(obj, separate = TRUE, file.stem,
                         extension = NULL, format = "csv",
                         impvar = "imp", orig.data = TRUE,  …)an object of class "amelia"; typically output from the
    function amelia.
logical variable. If TRUE (default), the
    imputed datasets will be written to separate files, whose names come
    from the file.stem and extension arguments. If FALSE,
    the imputations are stacked and written as a single file.
the leading part of the filename to save to
    output The imputation number and extension will be added to
    complete the filename. This can include a directory path.
the extension of the filename. This is simply what
    follows file.stem and the imputation number.
one of the following output formats: csv,
    dta or table. See details.
the name of imputation number variable written to the
    stacked dataset when separate is FALSE.
logical variable indicating whether the original,
    unimputed dataset should be included in the stacked dataset when
    separate is FALSE.
further arguments for the write functions.
write.amelia writes the imputed datasets to a file or a set of files
  using one of the following functions: write.csv,
  write.dta, or write.table. You can pass arguments to
  these functions from write.amelia.
When separate is TRUE, each imputed dataset is written
  to its own file. If you were to set file.stem to
  "outdata" and the extension to ".csv" , then the
  resulting filename of the written files will be
    outdata1.csv
    outdata2.csv
    outdata3.csv
    ...
  and so on.
When separate is FALSE, the function adds a variable
  called impvar to each dataset which indicates the imputed
  dataset to which the row belongs. Then, each of the datasets are
  stacked together to create one dataset. If orig.data is TRUE,
  then the original, unimputed dataset is included at the top of the
  stack, with its imputation number set to 0.