Sample Quiz #3

Consider this randomized block design

a1 a2 a3 a4
s1 a d g j
s2 b e h k
s3 c f i l

1. Use orthogonal coding to code this design. Indicate which columns are for which effects. Hint: More columns are provided than are needed.

   x1  x2  x3  x4  x5  x6  x7  x8  x9  x10
   
a

b

c

d

e

f

g

h

i

j

k

l

2. Give the Stata commands beginning with regress that will test the A main effect or use R²'s to compute the F-ratio for A main effect.

Stata commands: 


or

                           / (         )
F = ______________________________________
    (                    ) / (         )