This is probably my most hated word on the internet.
Sony
08q3_sony.pdf, page 5, table 1, row 3:
"PS3: 4.46 million units"
08q2_sony.pdf, page 4, table 3, row 3:
"PS3: 2.43 million units"
08q1_sony.pdf, page 4, table 2, row 3:
"PS3: 1.56 million units"
07q4_sony.pdf, page 5, table 1, row 3:
"PS3: 9.24 million units"
The final figure is for YE March 31, so removing the previous three quarters gives the Jan-Mar figure.
9.24-(4.9+1.31+0.71) = 2.32 million units.
So 2.32 + 1.56 + 2.43 + 4.46 = 10.77 million units.
Microsoft
Q2-09_10Q.doc, page 26, paragraph 5:
"We shipped 6.0 million Xbox 360 consoles during the second quarter of fiscal year 2009"
Q1-09_10Q.doc, page 22, paragraph 1:
"We shipped 2.2 million Xbox 360 consoles during the first quarter of fiscal year 2009"
Q4-08_10Q.doc, page 14, paragraph 3:
"We shipped 1.3 million Xbox 360 consoles during the fourth quarter of fiscal year 2008"
Q3-08_10Q.doc, page 21, paragraph 2:
"We shipped 1.3 million Xbox 360 consoles in the third quarter ... of fiscal year 2008"
6.0 + 2.2 + 1.3 + 1.3 = 10.8 million units.
what's this stuff? "13Q 2.18mpq"
How many quarters each unit has been on sale for; millions of units sold per quarter, taking a direct (and hence unseasonal) average.
Only thing is I have the Xbox at exactly 28.5 to date, and PS3 at exactly 21.3. 16.84 end September +4.46 End December=exactly 21.3. So I wonder where these two decimal precision figures such as 21.35 PS3 are coming from.
Typically I've seen only MS give figures to one place (aka 6.0 million) and Sony to two (4.46). Not sure where people would be getting more exact or differing (in the Sony case) figures than I have..
360 Q2 (Jan-Mar 06) was reported to two decimal places (1.75m), hence the additional 0.5 which you must not have. PS3 was 16.89m end Sep, perhaps their erroneous reporting of FY to March 07 is the difference, you may have used a slightly different calculation there. The one I used tallies with the Nintendo shipped comparisons, which has every other quarter for PS3 spot on.