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I designed a choice experiment of 3 attribute + payment attribute, with support.CEs package. The choice set have 2 improvement alternative (alt.1 and alt.2) + 1 alternative status quo (alt.3). However in the question 3, one improvement alternative have only SQ levels, so I will have 2 alternative with status quo alt.1 and alt.3. So can I have a choice set with 2 SQ alternative? I did not copy the SQ alternative (al.3).

Thanks

Question 1

alt.1 alt.2

Bdv "medium" "sq"

W "sq" "sq"

A "better" "sq"

Price "2000" "1000"

Question 2

alt.1 alt.2

Bdv "better" "better"

W "better" "sq"

A "better" "medium"

Price "0" "2000"

Question 3

alt.1 alt.2

Bdv "sq" "sq"

W "sq" "better"

A "sq" "medium"

Price "0" "0"

Question 4 ..... Question 5 ..... Question 6 ..... Question 7 ..... Question 8 ..... Question 9 .....

library(support.CEs) des1 <- rotation.design(attribute.names = list( Bdv = c("sq", "medium", "better"), W = c("sq","medium","better"), A = c("sq", "medium","better"), Price = c("0", "1000", "2000")), nalternatives = 2, nblocks = 1, row.renames = FALSE, randomize = TRUE, seed = 1000)

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