STAT115 Chapter 7.3 Multidimensional Scaling (MDS)

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I have a likely stupid question: Starting ~ 5:04 the statement is that it reduces the data to a 2D graph. I get the first calculation to obtain the cell distances, but if you run the distances with 4 cells, that leaves you with 5 distance values (1 vs 2, 1 vs 3, …, 3v4), corresponding to 3 per per cell (cell 1vs2, cell1v3, 1v4, 2v1, 2v3, 2v4, etc.) How do you go from that to the graph at 5:04?

LuckyDrD