Two fact-finding projects on children and poverty are under attack by public service cost cutting.

The uncertain future of two comprehensive studies on children and poverty has sparked fears the data gap will lead to leaky sieve policies. How can we fix problems we don't know about?

Two long term surveys focussing on children and poverty are the casualties of public service cost cuts, raising fears that without the data there is no real measure of hardship afflicting families in Aotearoa.

The future of Auckland University's Growing Up in New Zealand study involving several thousand children and their families is uncertain after the government did not renew its contract in February.

The university and the government are looking at the funding options for the 15-year-old study which covers a range of topics from mental health to schooling.

In the same week that news of that study's future funding was at risk, StatsNZ axed its own unique but short-lived Living in Aotearoa survey.

"This Living in Aotearoa survey was set up to measure whether families or children were living in persistent poverty," says Newsroom political editor Laura Walters. "If you don't have that data, then you don't have a measure of persistent poverty."

Without the data, governments could argue that there are no families living in persistent poverty, she says.

"But can you say that truly if you don't have the data to back it up?"

The cut to one study and uncertainty over another reflect the pressures on research and universities, particularly the high-cost projects such as multi-year longitudinal studies, says Walters.

The Living in Aotearoa survey included communities that often fall through the cracks when it comes to collecting data such as tax information because they may be unemployed households. Walters says it was a way of capturing that information about families and children.

"StatsNZ were really proud of this survey and its unlikely that they wanted to cut it but like every other ministry at the moment they have to find efficiencies. They need to cut programmes, they need to cut jobs. And this, while being very good quality data it's also incredibly expensive to gather and they found it wasn't a very efficient way of getting these statistics," she says.

Walters was actually a participant in the survey and says it was time consuming both for the surveyor and her own family. Surveyors have to go into often remote communities where they have no connections, convince people to take part and convince them to stay involved…

Go to this episode on rnz.co.nz for more details