Sets the noncentrality parameter.
The sequential design object
The noncentrality parameter
The noncentrality paraeter is the expected drift at the end of the study. For example, if the study has a power of 80% using a one sided Z-test with 2.5% type 1 error, the noncentrality parameter is q(0.975)+q(0.8), where q() is the percentile function of the standard normal distribution.
an object of class "sequential.design"
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