nlmixr has a nice option "keep" to transfer additional columns from the input data to the output, however for instead of preserving values it enumerates the data.
Example:
theo_sd$SEX <- "MALE"
theo_sd$SEX[ theo_sd$ID > 6 ] <- "FEMALE"
fit0 <- nlmixr(one.cmt, theo_sd, list(print=0), est="focei")
fit1 <- nlmixr(one.cmt, theo_sd, list(print=0), est="focei", keep=c("SEX"))
Fit1 will include additional column "SEX" not required model fitting, however instead of original values it will contain enumerated values.
unique( fit1$SEX )
[1] 1 2
It could be more convenient if "keep" transferred original values to the output dataset.
nlmixr has a nice option "keep" to transfer additional columns from the input data to the output, however for instead of preserving values it enumerates the data. Example: theo_sd$SEX <- "MALE" theo_sd$SEX[ theo_sd$ID > 6 ] <- "FEMALE" fit0 <- nlmixr(one.cmt, theo_sd, list(print=0), est="focei") fit1 <- nlmixr(one.cmt, theo_sd, list(print=0), est="focei", keep=c("SEX"))
Fit1 will include additional column "SEX" not required model fitting, however instead of original values it will contain enumerated values. unique( fit1$SEX )