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ST 520 Statistical Principles of Clinical Trials - NCSU Statistics ...

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CHAPTER 10 <strong>ST</strong> <strong>520</strong>, A. TSIATIS and D. Zhang<br />

Although an information-based monitoring strategy, such as that outlined in section 10.5.2, is<br />

not always practical, I believe that information (i.e. [se{ ˆ ∆(t)}] −2 ) should also be monitored as<br />

the study progresses and if this deviates substantially from that desired, then the study team<br />

should be made aware <strong>of</strong> this fact so that possible changes in design might be considered. The<br />

earlier in the study that problems are discovered, the easier they are to fix.<br />

PAGE 196

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