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01:03
Putting a question on hold wont affect your ability to edit the question (it only prevents answers -- it's specifically to allow a question to be fixed without people answering it while it's still in the middle of being worked on)
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.
With signed rank tests (on paired data) and rank sum tests, people occasionally turn up here very confused when their medians are exactly the same but the test rejects. It's not that much of a surprise when you know what the tests are actually looking at.
 
11 hours later…
12:42
@Glen_b I've found that asking the question "What problem are we trying to solve?" early and often is a great way to keep R&D teams focused on how to get good results for their business, and to have a tight connection between what management wants and what scientists produce
2
 
10 hours later…
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.
The question of what problem they're trying to solve isn't even important enough in their mind to put in an explanation of the situation they're asking about? No wonder they're confused about what to do.

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