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I'm new in D-efficiency. I tried to do design a choice experiment using algdesign to do a D-efficiency design.

So I have the follow code:

trials = optFederov(data = data, center = FALSE, criterion = "D")
trials

$design
   X1 X2 X3 X4
3   3  1  1  1
13  1  2  2  1
26  2  3  3  1
32  2  2  1  2
34  1  3  1  2
38  2  1  2  2
45  3  3  2  2
46  1  1  3  2
51  3  2  3  2
55  1  1  1  3
68  2  2  2  3
72  3  3  2  3
78  3  2  3  3
80  2  3  3  3

If I want 2 alternative per choice set, how can I do it?

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