Friday, March 12, 2010

Weighing into this poll weighting controversy

The latest YouGov poll shows Labour at 34%, just three points behind the Tories on 37%. But how believable is this? I must admit to doing a double-take when I saw the figures. So I did what I haven't done for some time - I actually went to the YouGov site to look at their tables.

The tables for the latest poll arn't up, but yesterdays (which had Con 37%, Lab 32%) was there.

YouGov weight by newspaper affiliation, and here's how the data looked for yesterday's poll:


Newspaper Type Uneighted Weighted
Express / Mail 370 236
Sun / Star 204 323
Mirror / Record 140 235
Guardian / Independent 128 59
FT / Times / Telegraph 173 140
Other Paper 181 184
No Paper 275 294


And here's what the Guardian reports daily newspaper circulation to be:


Express/Mail 2,790,884 (677,750 + 2,113,134)
Sun/Star 3,647,893 (2,862,935 + 784,958)
Mirror/Record 1,540,255 (1,225,502 + 314,753)
Guardian/Independent 487,480 (300,540 + 186,940)
FT(UK)/Times/Telegraph 1,314,825 (115,447 + 521,535 + 703,249)


Looking at the above, YouGov are right to scale down their Guardian/Independent respondants sharply. The problem seems to be in the tabloid section. They are not getting many raw Sun/Star readers, and getting way too many Express/Mail readers. And it's hard to work out why they've weighted the Mirror up.

I guess this is the problem with online polling. The types of people who read the Sun and Mirror will be construction workers, plumbers, front line people who can't log onto the net during work hours, and who probably can't be bothered to go online when they get home either, especially if there is sport or soaps on TV (or the pub to go to). In addition, you get activists such as BNP types who organise to sign up to all the online polling units - and they probably give their political affiliation as Labour, to tie in with their line, "I used to vote Labour, but..." Hence the reason YouGov ask them what newspaper they read (it's less likely they will fake that, and this may account for the number of Express/Mail respondants in the unweighted figures). You can see why YouGov are having a mare and weighting their respondants to correct for this.

My hunch (and that's all it is), is that the telephone pollsters will be more accurate, as these biases simply won't occur for them. But we shant find out till the general election. Labourites should assume that there is still a ton of work to do, and should not relax till the telephone pollsters show us closing the gap.

4 comments:

Anonymous said...

"The types of people who read the Sun and Mirror will be construction workers, plumbers, front line people who can't log onto the net during work hours, and who probably can't be bothered to go online when they get home either, especially if there is sport or soaps on TV (or the pub to go to)."

Christ, could you be any more patronising? Your blog is an endless dismal outpouring of NuLab propaganda. Who the hell are you? Hazel Blears?

DevonChap said...

Oh, fantastic sterotype:

"The types of people who read the Sun and Mirror will be construction workers, plumbers, front line people who can't log onto the net during work hours, and who probably can't be bothered to go online when they get home either, especially if there is sport or soaps on TV (or the pub to go to). "

Subtext: 'Oh no, that type of people just can't be bothered. Those lazy working classes, not as diligent as us smart middle class. That's why we need a Labour government . To tell them what to do as theu can't think for themselves poor dears.'

Madasafish said...

"

Well I read the Sun and the Mirror...and I would never stereotype people like that.

And if the Tories did, you would be mortally offended..

No wonder the WWC are going to the BNP when Labour supporters make such wild and unproven claims about them...

snowflake5 said...

DevonChap - I can't be bothered to respond to online polls after a hard day at work, which is why I feel that Sun and Mirror people won't either.

And it remains a fact that if you are doing any sort of front-line work, you simply can't go online during work hours. Many people who work in front of a PC are usually too busy to surf too. People like yourself (Tories!) with a lot of time on their hands are, well, unusual.

Madasafish - if you are convinced that Sun/Mirror readers respond to online polls as much as anyone else, how to you explain their low respondent rate?