Populus polling

I like opinion polls because I like looking at numbers, and the same numbers can tell completely different stories depending on the direction you yourself are coming from. But the first numbers I will be showing is the weighting I have mentioned it before. But how can an opinion poll suddenly get rid of nearly three quarters of its respondents and nearly double another section because they need to weight the poll out. Votes cast are always the best source, but find below some of the breakdown of the populus polling.

Populus weighting Actual respondents to poll (and the number they weighted it too) CON 607 (635) LAB 725 (658) UKIP 324 (91) LD 148 (227)
— General Election (@UKELECTIONS2015) September 20, 2014

Populus Aged 18-34 (65+) voting intentions LAB 46% (23%) CON 28% (45%) LD 15% (5%) GRN 6% (1%) UKIP 4% (21%) Certain to vote 32% (72%)
— General Election (@UKELECTIONS2015) September 20, 2014

Populus Male (Female) voting intentions LABOUR 34% (38%) TORIES 31% (35%) UKIP 17% (11%) LD 8% (9%) Absolutely certain to vote 64% (48%)
— General Election (@UKELECTIONS2015) September 20, 2014

Populus Those absolutely certain to vote Men 64% Women 48% Age 18-24 = 32% 25-64 = 53% 65+ = 72% party UKIP 79% CON 71% LAB 68% LD 56%
— General Election (@UKELECTIONS2015) September 20, 2014

http://www.populus.co.uk/wp-content/uploads/2014/09/OmOnline_Vote_19-09-2014_BPC.pdf