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585206
2017 Dec 14
2
delta and sd parameters for power.t.test
What is the rationale behind having both the delta and sd parameters for
the power.t.test function? For the relevant noncentrality parameter, we
only need the ratio delta/sd. If my effect size is given as Cohen's d,
then I only got that ratio and not sd.
As far as I see, in such a case, I can specify delta=d and leave sd at
its default value 1. Is this correct or am I missing something?