OK. I see that this is school work from your other posts.
But, anyway I don't believe that your get information about the automatic packet loss / re-transmit handling.
However, you can do something like this:
Continually transmit packets which include a serial number which you increment by one each time.
On the receiver side, simply look for gaps. That is where the serial number of the packet just received is more than one increment higher than in the previous packet received. From that, work out the proportion of missing packets.