โ Scribed by Thomas J. Smissth
No coin nor oath required. For personal study only.
The effects of regression towards the mean on visual disability rating scales are analyzed. Some current strategies underestimate true visual disability by approximately 20% because they selectively retest missed points. This error does not occur if single pass or global retesting is utilized. Global retesting is a cost effective method of minimizing this problem and decreasing test variance.
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