Here is the week 19 update in terms of the two big consoles in Japan's path to be able to reach the commonly stated (in these sales threads) estimates for 2018 sales (2 mil for PS4, 4 mil for Switch) .
TWS | GD | YTD | AWN (Change) | |
PS4 | 17,688 | -16,762 | 846,355 | 34,958 (+508) |
Switch | 31,720 | -59,853 | 918,236 | 93,386 (+1813) |
TWS - This week's sales
GD - Goal differential, the difference between the average week needed from last week compared to this week's sales
YTD - Units sold in 2018 so far including this week's sales
AWN - Average weekly sales needed to reach the estimate for the console.
Both consoles slide in sales post Golden Week. PS4 is now at 1/2 AWN and Switch is at 1/3 AWN. If similar sales continue then by this the Switch will have to sell on average 100,000 console each week for the last half of 2018 to reach 4 million units sold.