Nothing
library(SASxport)
Sys.setenv("TZ"="GMT")
lookup.xport('puromycin.xpt')
## By default, character variable "STATE" should be converted into a
## factor
x <- read.xport('puromycin.xpt')
str(x)
stopifnot( class(x$STATE)=="factor" )
## When as.is=TRUE, character variable "STATE" should be preserved as
## a character variable.
x <- read.xport('puromycin.xpt',as.is=TRUE)
str(x)
stopifnot( class(x$STATE)=="character" )
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