Message-ID: <493F0195.6050004@gmx.de>
Date: 2008-12-09T23:39:01Z
From: Stephan Kolassa
Subject: Power calculations where two samples are of unequal size
In-Reply-To: <bd93cdad0812091532g7ccc429fl5185e3d573c46188@mail.gmail.com>
Hi Farrel,
I usually simulate in cases like this - pick the effect size and
distributions you conjecture, simulate your data 10,000 times and look
how often t.test() gets you a significant difference.
Good luck,
Stephan
Farrel Buchinsky schrieb:
> I have used the function power.t.test() (power calculations for one
> and two sample t tests) but have noted that it handles the samples as
> being the same size. How does one handle sample sizes that are
> different. In other words how does one handle unbalanced designs.
>
> Farrel Buchinsky
>
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