Question on RSSI impact on accuracy?

[IoTThinks]

Hi all,
Thanks for the awesome project.
I understand that the RSSI will be taken into consideration for machine learning.

In this URL https://www.internalpositioning.com/doc/faq.md#minimum, it is mentioned that the graphs are "similar". And "This indicates that these two places are probably too close together."

For a layman, these graphs are actually not similar to me.
They are similar with the same detected access points (SSID / BSSID)
However, the RSSI and power are different?

Hence, in this case, the system "should" differentiate the locations of the two graphs, right?
Any advice is appreciated.
Thanks a lot.

[schollz]

Those two graphs are pretty similar. Yellow, red and blue are all overlapping the same regions with small shifts. Only green is very different, but not by much.

[IoTThinks]

@schollz Yes, you are right. If we only consider the X-axis then yellow, red and blue are quite the same in two graphs.

BTW what is the unit of the Y-axis?
The values of Y-axis are different.
Hence, the "shapes" in two graphs are different.
Except the yellow graph, the rest have different shape in two graphs.

Thanks a lot for replying me. :)