A follow-up from my recent post taking a quick and dirty look at polling numbers. As per usual, these polls are certainly not 100% reliable.
In this case, the poll [PDF] was carried out by GAPS for the pro-independence AMI. What that means is hard to say but they certainly don't appear to have asked respondents about a possible '3rd way' of increased self-government for Catalonia. This option, were it made available to voters, would reduce the weight of the independence vote. This is pointed out by another poll carried out by pro-federal newspaper El Periódico. Their poll suggests equal support for increased autonomy and independence, but confirms 80% support for some change in the relationship between Catalonia and Spain.
The other potentially misleading change in the GAPS poll is that it includes 16 and 17 year-olds and non-Spanish citizens. That is to say, everyone aged 16 up and registered legally with a town hall in Catalonia. This is not the same as other polls that have used the same electorate as vote in elections to the Catalan parliament, which is limited to Spanish citizens of 18 years and over registered with a Catalan town hall.
It's difficult to say how much of a difference this would make: 16 and 17 year olds in, say, Olot are probably a lot (heh) more likely to vote yes to independence. But there aren't that many of them. There are plenty more people of South American origin of all ages in BCN metro who are less likely to vote Yes.
All that said, this newest poll results in a 50% point lead for the Yes vote. Even an enormous margin of error would still leave a significant majority voting in favor of independence. Here are the numbers:
1% = 54138,50
YES 3167102 (58.5%)
NO 1044873 (19.3%)
Remove undecided and abstentions.
Total: 4211975 (1% = 42119.75)
*NB – I have just used the same number for the electorate as before because it would take me too long to work out the adjusted number. It doesn't affect the percentages anyway.
My opinion: if a referendum were ever held (which doesn't seem likely), it would naturally come down to the question. If a 3rd option of increased autonomy were included, this would successfully split the pro-independence vote. If it was a simple Yes/No question, the Yes response would win a massive victory.
I feel that this makes the likelihood of a referendum being held seriously unlikely. Spain will find it much easier to avoid negotiating with Catalonia if it prevents a vote from happening. Currently, the situation probably favored in Madrid is that Catalonia doesn't hold a referendum but rather issues a unilateral declaration of independence (UDI). This would seriously limit vital international support and enable Madrid to depict the Catalan government as acting undemocratically.