convertNA: Convert a character pattern or numeric value into NA and vice...
In epifit: Flexible Modelling Functions for Epidemiological Data Analysis

Description Usage Arguments Value See Also Examples

Convert a character pattern or numeric value into NA and vice versa.

1 2	convertNA(data = NULL, na.character = c(""), na.numeric = NA, fromNA = FALSE)

`data`	a data.frame to summarize.
`na.character`	a character vector specifying missing character.
`na.numeric`	a numeric vector specifying missing value.
`fromNA`	a logical value specifying replacement that NA is replaced with the first element of na.character or na.numeric.

a data.frame with NA replacement.

countNA

dat <- data.frame(a=c("","2","3"),b=c("4", NA, "."), c=c(-1,1,3),
                  d=c(NA,3,2), stringsAsFactors=FALSE)
dat2 <- convertNA(dat, na.character=c("", "."))
dat3 <- convertNA(dat, na.character=".", na.numeric=-1, fromNA=TRUE)
dat
dat2
dat3