大家好 想请教一题机率问题 老师有提供解答 但我不太理解个中原因 还请各位高手不吝指点 感激不尽！！ Genotypes AA, Aa, and aa occur with prob (pi_1, pi_2, pi_3). For n=3 independent observations, the observed frequencies are (n1, n2, n3). Explain how you can determine n3 from knowing n1 and n2. Thus, the multinomial distribution of (n1,n2,n3) is actually two-dimentional. 答案是 the sample size is fixed: n=n1+n2+n3 但题目不是说 n=3 independent observations? 坦白说不是很能理解其中的frequency 和observation 的意思 有上网查了一下genotypes 似乎是一个类似2x2矩阵的结构 不知道有没有大大愿意给小的一点指导？ 谢谢大家！ 感谢 -- --

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