Here is dummy data

```
temp.df <- data.frame(count = rep(1,6), x = c(1,1,NA,NA,3,10), y=c("A","A","A","A","B","B"))
```

When I apply aggregate as given below:

```
aggregate(count ~ x + y, data=temp.df, FUN=sum, na.rm=FALSE, na.action=na.pass)
```

I get:

```
x y count
1 1 A 2
2 3 B 1
3 10 B 1
```

However, I would like the following output:

```
x y count
1 NA A 2
2 1 A 2
3 3 B 1
4 10 B 1
```

Hope it makes sense.Thanks in advance.