Can I write the sentence—The curvature is defined by second derivative, the best estimation of the second derivative basing on three measurements is XXX.— like this:
The curvature is defined by second derivative, the best estimation of which basing on three measurements is XXX.
Or I must put "which" at the beginning of the subsentence if I want it to refer to the construct at previous subsentence? Like this:
The curvature is defined by second derivative, which ...
(In this case how do I rephrase the initial sentence in order to avoid repetitions?)