[R] Choose between duplicated rows

[francy]

I also tried using Jim's code, but it doesn't work as expected with my real
dataset. This is what I did:

Best.na <- do.call(rbind, lapply(split(x, x$A), function(.grp){ 
     best <- which.min(apply(.grp, 1, function(a) sum(is.na(a)))) 
     .grp[best, ] 
 })) 

df.split <- split(Best.na, Best.na$id)

Best.date <- lapply(df.split, function(x){

    # Select by given criterion
     y <- x[which(max(x$A) == x$A),]
    y
})
Best.date <- do.call(rbind, Best.date)


Thank you again for your help.  

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