• Professor, Future Fellow and Head of Statistics at UNSW, and a Deputy Director of the Australian Centre of Excellence in Mathematical and Statistical Frontiers (ACEMS), UNSW
Better opinions polls are more expensive because pollsters need to spend more effort getting a representative and honest sample of voters. Shutterstock

Here’s how to make opinion polls more representative and honest

You could compare election opinion polls to penalty shoot-outs at a World Cup final: there’s huge pressure to get it right and we remember the big misses most of all.
The Australian Bureau of Statistics’s Chief statistician David Kalisch announcing the result of the same-sex marriage postal survey. AAP Image/Lukas Coch

What the numbers say (and don’t say) in the same‑sex marriage survey

Not everyone who could vote did vote in the voluntary postal vote on same-sex marriage. So what can we draw from the result if only four out of five eligible Australians took part?

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