How Can Scattered Data Impact Tool Performance Analysis?

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I'm sorry, without thinking about it, I was using the time-series terminology "cross correlation". That was probably misguiding. It's just the correlation between the two variables that I was thinking of.
 
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I have also computed the Pearson's correlation coefficient of the average values of draft with respect 'speed and depth, respectively. The correlation is higher with speed than with depth.

Instead, by computing the Pearson's correlation coefficient of the time based draft with respect 'time based speed and depth, respectively, sometimes, the reselts are pretty variable. Sometimes, the correlation is strong, other times the correlation is weak. Sometime, the correlation is stronger with speed, other times is stronger with depth.