Just one final (probably!) dip into the details of last week's YouGov referendum poll. Unlike the recent Ipsos-Mori poll or the second Panelbase poll commissioned by Wings over Scotland, there doesn't seem to have been any direct attempt made to discover how the Don't Knows are more inclined to vote. However, there was one question on the economy which produced responses that correlated extraordinarily closely to actual voting intentions - just 2% of Yes voters thought that an independent Scotland would be economically worse off, while 0% of No voters thought it would be economically better off. So it struck me that the responses of undecided voters to that question might furnish us with a very useful indirect way of detecting which way those people may be leaning. Irritatingly, YouGov haven't provided that particular cross-break, but it's still possible to get a rough idea by extrapolating from the percentages elsewhere in the datasets. These numbers won't be absolutely dead-on accurate, but they'll be reasonably close.