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In a separate study, the accountancy firm Deloitte's consumer tracker found 51% of people were downbeat about their household's disposable income, up two percentage points from 49% in the previous quarter.
A number of studies have examined consumer tracker accuracy [ 6, 9– 18], however, six studies were based upon earlier versions of Fitbit devices, and the methodology for assessing reliability and validity varied considerably.
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The competition for pricing accuracy has made companies involved in real-time bidding among the Internet's most aggressive consumer trackers.
Consumer trackers are much more usable, but their data needs to be audited and treated with regard to what kind of device it comes from.
To date, no studies have assessed reliability and validity of consumer trackers in both laboratory and free-living conditions.
Lee et al. [ 12] investigated various consumer trackers during different semi-structured activities (the participants followed a 69-min protocol), and compared total energy expenditure with the gold standard (breath-to-breath analysis).
Separately, our monthly consumer insight tracker shows there has been a significant increase over the last year in the number of people dipping into their savings to pay for their groceries, with around a third (36%) now compared to a quarter (25%) last year.
And in 2008, women purchased 74% of books sold in the relationship and family category, according to book consumer trends tracker R.R. Bowker.
A report out Thursday by SpendingPulse, a consumer spending tracker of Master Card Advisors, shows that Americans spent less in October than they did in September, though slightly more than in October 2008.
For the NHS, consumer fitness trackers that are regulated under the "wellness" category, and not to the same standards as medical equipment, are a curio rather than a solution.
"The PC market has definitely hit a slow patch," said Loren Loverde, VP for worldwide consumer device trackers at IDC.
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