Edit:
The site has gone on some updates with the data, which had a slight impact. With the latest data, the correlations are:
Wii - X360 : -0.52
Wii - PS3 : - 0.66
X360 - PS3 : -0.30
The difference is that the negative correlation between Wii & PS3 has increased, while decreasing between Wii & X360, and remaining the same between X360 & PS3. The essence of the analysis that the real competition is between HD consoles and the Wii does not change, however, now that the gap between Wii-PS3 and Wii-X360 correlation is significantly larger, we can say that Wii is in stiffer competition with PS3 than with X360. In other words, Wii is stealing more sales from PS3 than from X360 (in terms of percentages).
For those who are interested the link above is also updated.
Playstation 5 vs XBox Series Market Share Estimates
Regional Analysis (only MS and Sony Consoles)
Europe => XB1 : 23-24 % vs PS4 : 76-77%
N. America => XB1 : 49-52% vs PS4 : 48-51%
Global => XB1 : 32-34% vs PS4 : 66-68%
