Parametric dispersion relations which separately test complex scaling and Regge fits to the inelastic structure function $W_2(\nu ,q^2)$ are found and evaluated. The numerical results indicate that precocious complex scaling is consistent with the present electroproduction data. The sum rule for the Regge fits is very restrictive and eliminates many of the fits proposed in the literature. The two fits which satisfy the sum rules are ones made by Pagels and by Preparata.

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