Enlarge number of imputations by combining mids objects

This function combines two mids objects x and y into a single mids object, with the objective of increasing the number of imputed data sets. If the number of imputations in x and y are m(x) and m(y), then the combined object will have m(x)+m(y) imputations.

Usage

ibind(x, y)

Arguments

x: A mids object.
y: A mids object.

Value

An S3 object of class mids

Details

The two mids objects are required to have the same underlying multiple imputation model and should be fitted on the same data.

Author

Karin Groothuis-Oudshoorn, Stef van Buuren

Examples

data(nhanes)
imp1 <- mice(nhanes, m = 1, maxit = 2, print = FALSE)
imp1$m
#> [1] 1

imp2 <- mice(nhanes, m = 3, maxit = 3, print = FALSE)
imp2$m
#> [1] 3

imp12 <- ibind(imp1, imp2)
imp12$m
#> [1] 4
plot(imp12)