Solow A R
Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA.
Biometrics. 2000 Dec;56(4):1272-3. doi: 10.1111/j.0006-341x.2000.01272.x.
A common problem in ecology is to determine whether the diversity of a biological community has changed over time or in response to a disturbance. This involves testing the null hypothesis that diversity is constant against the alternative hypothesis that it has changed. As the power of this test may be low, Fritsch and Hsu (1999, Biometrics 55, 1300-1305) proposed reversing the null and alternative hypothesis. Here, I return to the original formulation and point out that power can be improved by adopting a parametric model for relative abundances and by testing against an ordered alternative.
生态学中的一个常见问题是确定生物群落的多样性是否随时间变化或对干扰做出响应。这涉及检验多样性恒定的原假设与多样性已发生变化的备择假设。由于该检验的功效可能较低，弗里奇和许（1999年，《生物统计学》第55卷，第1300 - 1305页）提议颠倒原假设和备择假设。在此，我回到最初的设定，并指出通过采用相对丰度的参数模型以及针对有序备择假设进行检验，可以提高功效。
