External Globals:

_AMgap

number of iterations for IP, SIP, and VIP between any two concurrent final imputations (default=100) (this global lets the user control how many iterations of each method are run between creating an imputed data set).

_AMimps

1 to save thetas when making imputations; 0 not to save thetas (default)

_AMnew

string name for the new completed data datasets. Appended to this name is a number for each dataset, consequently _AMnew should be 6 characters or less. Default is file if the program was called as amelia("file") and newdat if a matrix was fed to amelia.

_AMnds

number of datasets created by imputation procedures (5 is default).

_AMsn

number of draws from the approximating distribution for importance sampling is equal to the number of datasets to be imputed _AMnds $\times$ _AMsn (default for _AMsn is 10). Consider increasing this if the number of resamplings is about the same as _AMnds.

_AMsfac

factor by which to multiply the variance matrix used in the importance sampling, 1.1 is the default

_AMst

0 (default) for multivariate normal distribution; greater than 2 for multivariate t distribution, with _AMst degrees of freedom

_AMtype

string name of file extension for imputed datasets; options are WKS for Lotus v1.0, XLS for Excel v2.1, WQ1 for Quattro v1.0, WRK for Symphony v1.0, DB2 for dBase II, DBF for dBase III, DB for Paradox v3.0, CSV, TXT, or ASC for ASCII character delimited, PRN for ASCII formatted, DAT for GAUSS data set (default=DAT). If running Gauss in operating system other than Windows, must set _AMtype to default.

_AMvcm

Calculate variance matrix using 1 the VIP simulation method (default); 2 the inverse of the negative Hessian; 3 outer product gradient method.