Nothing
AddCox = function(nmData, coxData, coxCol, dateCol = "DATE", idCol = "ID")
{
coxData = coxData[order(coxData[, idCol], coxData[, dateCol]), ]
nmData[, coxCol] = NA
nrNm = NROW(nmData)
for (i in 1:nrNm) {
cID = nmData[i, idCol]
cDATE = nmData[i, dateCol]
cDAT = coxData[coxData[, idCol] == cID & coxData[, dateCol] <= cDATE, , drop=F]
nrcDAT = NROW(cDAT)
if (nrcDAT > 0) {
nmData[i, coxCol] = cDAT[nrcDAT, coxCol]
} else {
cDAT = coxData[coxData[, idCol] == cID, , drop=F]
if (NROW(cDAT) == 0) { nmData[i, coxCol] = NA
} else { nmData[i, coxCol] = cDAT[1, coxCol] }
}
}
if (sum(is.na(nmData[, coxCol])) > 0) warning("There is NA value in the result!")
return(nmData)
}
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