Thankfully there are a lot of pollsters working on this and Survation and Panelbase, at least, seem to be running with a slightly different methodology.
The big question seems to be over how the voting pattern will differ from 2011. But however you weight it, No is in the lead and always has been.
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John Curtice has some useful analysis:
http://blog.whatscotlandthinks.org/2...teady-but-low/