01:18
@pyeR_biz Many a time I have begun to write a question and solved it myself, just by framing it clearly enough to ask properly. If anything, the discipline involved in asking a good question can be considerably harder than merely answering it. Practice at asking "the right question" is an important skill but it's not one many people get to practice. There's a corresponding skill in answering questions, which is identifying the "right" question amongst what someone posts.
4
@mlane A paired signed-rank test doesn't directly test for a difference in medians, it's actually the pseudomedian, or one-sample Hodges-Lehmann statistic (the median of the Walsh-averages of the pair-differences). If the population distribution of pair-differences is symmetric under the null (which assumption you need for exchangeability of signs in the permutation test), then the population median and the population pseudomedian will coincide as long as both are unique.
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22:45
I couldn't agree more. On another site that I respond to stats questions on, it must be the phrase (or some variation on it) that I type most often there. I don't know how many times (thousands perhaps, certainly many hundreds at least) I see questions that ask about what analysis to do that give no indication of what they're trying to find out.
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