Question: 2.29 For a 2 2 table of counts {nij}, show that the odds ratio is invariant to (a) inter- changing rows with columns, and

2.29 For a 2 × 2 table of counts {nij}, show that the odds ratio is invariant to

(a) inter-

changing rows with columns, and

(b) multiplication of cell counts within rows or within columns by c≠ 0. Show that the difference of proportions and the relative risk do not have these properties.

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