Some VRTs are nearly costless (e.g., CRN), but others could entail considerable extra cost (e.g., external CV), and this must be taken into account when deciding whether a particular VRT is worth it. Let V0 be the appropriate variance measure with a straightforward simulation (without using a VRT) and let V1 be the corresponding variance measure using a particular VRT. Also, let C0 and C1 be the costs of making a particular number of runs of a particular length with the straightforward and VRT approaches, respectively. Find conditions on V0, V1, C0, and C1 for which the VRT would be advisable.
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