Constructor for imputationList objects
Create and update imputationList objects to be used as input to other
MI routines.
imputationList(datasets,...) ## Default S3 method: imputationList(datasets,...) ## S3 method for class 'character' imputationList(datasets,dbtype,dbname,...) ## S3 method for class 'imputationList' update(object,...) ## S3 method for class 'imputationList' rbind(...) ## S3 method for class 'imputationList' cbind(...)
datasets |
a list of data frames corresponding to the multiple imputations, or a list of names of database tables or views |
dbtype |
"ODBC" or a database driver name for
|
dbname |
Name of the database |
object |
An object of class |
... |
Arguments |
When the arguments to imputationList() are character strings a
database-based imputation list is created. This can be a database
accessed through ODBC with the RODBC package or a database with a
DBI-compatible driver. The dbname and ... arguments are
passed to dbConnect() or odbcConnect() to create a
database connection. Data are read from the database as needed.
For a database-backed object the update() method creates variable
definitions that are evaluated as the data are read, so that read-only
access to the database is sufficient.
An object of class imputationList or DBimputationList
## Not run:
## CRAN doesn't like this example
data.dir <- system.file("dta",package="mitools")
files.men <- list.files(data.dir,pattern="m.\\.dta$",full=TRUE)
men <- imputationList(lapply(files.men, foreign::read.dta))
files.women <- list.files(data.dir,pattern="f.\\.dta$",full=TRUE)
women <- imputationList(lapply(files.women, foreign::read.dta))
men <- update(men, sex=1)
women <- update(women,sex=0)
all <- rbind(men,women)
all <- update(all, drinkreg=as.numeric(drkfre)>2)
all
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