I am trying to block an existing orthogonal design (http://www2.research.att.com/~njas/oadir/oa.32.9.4.2.txt) with Ngene. I deleted the 9th column of the existing design (I need only 2x4 attributes) and used the following syntax:
- Code: Select all
? This will block an orthogonal design with 32 choice situations into 4 blocks.
Design
;alts = scen1*, scen2*, none
;rows = 32
;block = 4
;eval = oa.32.9.4.2.xlsx
;model:
U(scen1) =
b1 +
b2 * forest[0,1,2,3] +
b3 * settle[0,1,2,3] +
b4 * flood[0,1,2,3] +
b5 * cost[0,1,2,3]
/
U(scen2) =
b1 +
b2 * forest[0,1,2,3] +
b3 * settle[0,1,2,3] +
b4 * flood[0,1,2,3] +
b5 * cost[0,1,2,3]
$
However, instead of just blocking the existing design, Ngene creates a completely new, blocked design. Can anyone tell me what I am doing wrong?
Alternatively: could I use the 9th, skipped column to block the design into 4 blocks? I remember reading that somewhere, but I am not sure whether it is actually working.
Cheers,
Andrea