## SE of ∆? [General Sta­tis­tics]

Dear all,

now I’m confused.
In Chow & Liu* ($$\small{(3.3.1)}$$ p.62, Table 3.4.1. p.65, and $$\small{(4.2.2)}$$ p.83) the standard error of the difference is given as $$\hat{\sigma}_\textrm{d}\sqrt{\frac{1}{n_\textrm{1}}+\frac{1}{n_\textrm{2}}}$$ I beg your pardon?

• Chow SC, Liu JP. Design and Analysis of Bioavailability and Bioequivalence Studies. Boca Raton: CRC Press; 3rd ed. 2009.

Dif-tor heh smusma 🖖
Helmut Schütz

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