The PB Guide to Polling Methodologies
When can you make valid historical poll comparisons? Almost everyday, it seems, someone on a thread or a journalist will seek to make polling comparisons with the 1990s and each time it happens myself and others will try to explain which this is not as easy as it appears. For there has been such a revolution in the UK polling industry since the aftermath of the 1992 general election that you have to be very careful when you point to…