June NPD numbers came in, so in continuing the series VGChartz.com took a look at the VGChartz hardware data in comparison to the data from the professionals. For reference, here are the comparisons done for March, April, and May NPD data.
In summary, May saw a setback as VGChartz was caught unawares by changing sales trends, overstating Xbox 360 and Nintendo DS sales by 40% and 20% and understating Playstation Portable sales by 30%. This month shows a lot of improvement, though the accuracy is still far from perfect and VGChartz must prove its ability to maintain this accuracy over time. See the comparison table below, which lists hardware sales figures for each platform for NPD's US numbers, Canada numbers, the total, and then the VGChartz NA numbers and the % difference between the NPD total and VGChartz.
NPD June covers sales from June 3rd through July 7th, 2007 -- a 5-week month. So if you're comparing to last month's figures, remember to add 25% to last month's data (or subtract 20% from this month's data) for a valid comparison.
Platform --- % Diff
VGChartz.com also took a look at how a pair of industry analysts, Michael Pachter of Wedbush Morgan Securities and Evan Wilson of Pacific Crest Securities, fared in their predictions of NPD numbers.
More after the Jump.