Ping RTT and Loss correlations with FTP
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Correlations between FTP & Ping throughput
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These two ping measures are plotted against the FTP data rate here: 
It can be seen that there is a strong correlation. It is not clear which ping method gives the better correlation. Since the Ping Data Rate method is simpler (easier to calculate, less dependent on anomalies due to say t100 being > t1000), we tend to use the Data Rate method. More details as to which node saw what response can be seen below where the ping throughput is plotted in log form. 
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Owner: Les Cottrell