Two national political opinion polls begun one day apart - two markedly different results

Two national political opinion telephone polls begun one day apart with two markedly different results made for some confusing headlines this week.

The clue may be in the mix of days of the week on which each poll was conducted, the fact that the first poll would possibly have included a higher number of younger voters due to the inclusion of mobile phone users and, the narrow question range in the second published poll.

POLL 1: FAIRFAX/IPSOS POLL, THURSDAY TO SATURDAY  9-11 APRIL 2015, 1404 RESPONDENTS, LANDLINE & MOBILE PHONES, MARGIN OF ERROR +/-2.6%

Financial Review 13 April 2015:

A promise to spare households more budget cuts, a focus on the economy and a raft of national security announcements has failed to help the Abbott government, with the latest poll showing Labor once more forging a strong lead over the Coalition.

The Ipsos/Fairfax media poll shows Labor leading the Coalition by 54 per cent to 46 per cent on a two-party-preferred basis, an increase from the 51-49 lead Labor held in the last such poll in early March.

Since that poll, the Coalition's primary vote has fallen 3 percentage points to 39 per cent and Labor's has risen 2 points to 38 per cent. The Greens are relatively steady on 13 per cent.

Labor leader Bill Shorten arrested a decline in his own personal ratings that showed up in the last poll. His approval rating was down a point to 42 per cent and his disapproval rating up a point to 44 per cent.

Mr Abbott's approval rating rose 2 points to 34 per cent and his disapproval rating fell 2 points to 60 per cent.

Mr Shorten has stretched his lead over Mr Abbott as preferred prime minister by 3 points. He now leads by 48 per cent to 38 per cent.

The telephone poll of 1404 voters was taken from Thursday night to Saturday night. It follows a busy period in which Mr Abbott has shrugged off the leadership insurrection that dogged him in February and embarked on a blitz of policy announcements and policy launches.

There has been a heavy emphasis on national security as well as the release of the intergenerational report, the tax discussion paper and a focus on multinational tax evasion, an issue on which Labor has seized the initiative..……

...support for the Coalition is greatest among higher-income households. Among voters with household incomes over $100,000, 49 per cent back Coalition policies and 29 per cent back Labor.

But Labor is more popular among medium and lower-income earners. Among voters from households with between $40,000 and $100,000 in annual income, 36 per cent back the Coalition and 34 per cent back Labor.

Among voters from households with annual income below $40,000, 39 per cent back the Coalition and 41 per cent back Labor.

POLL 2: NEWSPOLL, FRIDAY TO SUNDAY 10-12 APRIL, 1172 RESPONDENTS, LANDLINE PHONES, MARGIN OF ERROR +/- 3%

Channel 9 News 13 April 2015:

Labor continues to hold a two-party preferred lead over the Abbott government but opposition leader Bill Shorten has suffered a slump in ratings, the latest Newspoll shows.

With preferences from the Greens based on the last election, the ALP has a two-party lead of 51 per cent to 49 per cent, the poll conducted for News Corp at the weekend showed.

The Coalition has meanwhile opened a five-point margin over Labor on primary vote to be ahead by 41 per cent to 36 per cent.

The survey of 1172 voters found Mr Shorten's satisfaction fell three points to a 12-month low of 33 per cent while Prime Minister Tony Abbott's satisfaction climbed four points to also sit at 33 per cent……

UPDATE

Essential Research released an opinion poll on 14 April 2015. This survey was conducted online from the 9 to 12 March and is based on 1,002 respondents drawn from a self-managed consumer online panel of over 100,000 members 18 years of age and older. The majority of panel members have been recruited using off line methodologies, effectively ruling out concerns associated with online self-selection.