US Mac sales down as PC decline stablizes, but wildly-differing estimates by Gartner and IDC

US Mac sales down as PC decline stablizes, but wildly-differing estimates by Gartner and IDC:

US Mac sales fell year-on-year as part of the global decline in the PC market as consumers switch to tablets, phablets and smartphones – but the two major market analysts produced wildly differing estimates of the size of that fall.
IDC has a dramatic drop of 11.2 percent, from 2.14M in the third quarter of 2012 to 1.9M in the same quarter this year, while Gartner shows a much more modest decline of 2.3 percent from 2.2M (close to IDC’s number) to 2.1M …

The credibility of the numbers doesn’t improve when you look at overall US sales across manufacturers: down 0.2 percent according to IDC, while Gartner has them up 3.5 percent.

Gartner

IDC

The two are at least in broad agreement on the worldwide numbers, with the global PC market declining either 7.6 (IDC) or 8.6 (Gartner) percent. But something somewhere is screwy in the US estimates …

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