Hi

I have some question about program. I will describe a little bit about my data which consist of 5 attributes

1. Efficacy (low, moderate, high)

2. GI side effect (Yes, No)

3. Kidney side effect (Yes, No)

4. Slow disease progression (None, Moderate)

5. Price per month (<500, 501-1000, >1000)

I would like to generate 2 alternative and neither.

So, this is my syntax

Design

? This will generate a simultaneous orthogonal fractional factorial design with three blocks Design

;alts = Drug A, Drug B, Neither

;rows = 36

;orth = sim

;block = 6

;model:

U(Drug A) = b1 + b2 * Efficacy[1,2,3] + b3 * GI side effect[1,2] + b4 * Kidney side effect[1,2] + b5 * Slow disease progression[1,2] + b6 * Price per month[500,501,1000]/

U(Drug B) = b2 * Efficacy[1,2,3] + b3 * GI side effect[1,2] + b4 * Kidney side effect[1,2] + b5 * Slow disease progression[1,2] + b6 * Price per month[500,501,1000]/

U(Neither) = b0

$

My questions are....

1. On a formatted scenario, it is only show 2 alt but neither choice is disappeared. What should I do?

2. How can I define an appropriate row and block?

3. How about sample size calculation? Depend on this syntax, sample size should be at least 60 people?

4. Should I put ;foldover into this syntax?

Thank you