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Guidelines are given for users of the simple Yes/No signal detection experiment, who want to design their experiments to ensure a given precision for estimators of d. Additionally, simulations of small‐scale Yes/No and rating‐method experiments are employed, to investigate when the use of asymptotic results is justified. Finally it is shown how the pay‐off matrix for the Yes/No experiment may be manipulated in order to optimize precision. A general conclusion is that quite large experiments are needed in order to provide precise unbiased estimation of d, with sampling distributions which are not appreciably skewed.

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