ji.ds.levels: Provides access to the levels attribute of a variable
In datashield/ji.dev.cl: ji.dev.cl

Description Usage Arguments Value Author(s) Examples

this function is similar to R function levels

1	ji.ds.levels(datasources = NULL, xvect = NULL)

`datasources`	a list of opal object(s) obtained after login in to opal servers; these objects hold also the data assign to R, as `dataframe`, from opal datasources.
`xvect`	an R object (factor)

levels of xvect

Gaye, A. (amadou.gaye

{

# load that contains the login details
data(logindata)

# login
opals <- datashield.login(logins=logindata,assign=TRUE)

# Example 1: Get the levels of the PM_BMI_CATEGORICAL variable
ji.ds.levels(datasources=opals, xvect=quote(D$PM_BMI_CATEGORICAL))

# Example 2: Get the levels of the LAB_TSC   SHOULD NOT WORK AS IT IS A CONTINUOUS VARIABLE
ji.ds.levels(datasources=opals, xvect=quote(D$LAB_TSC))
}