Which of the following is a correct model with a categorical explanatory variable with three categories?
An experiment was performed with three treatments (A, B, and C). Which of the following is a correct model with a categorical explanatory variable with three categories?
yˆ = a +bx
where x = 0 if in treatment A, x = 1 if in treatment B, and x= 2 if in treatment C
yˆ = a +bxA + cxB + dxC
where xA = 1 if in treatment A, and = 0 if not in treatment A
xB = 1 if in treatment B, and = 0 if not in treatment B
xC = 1 if in treatment C, and = 0 if not in treatment C
yˆ = a + bxA + cxB
where xA = 1 if in treatment A, and = 0 if not in treatment A
xB = 1 if in treatment B, and = 0 if not in treatment B
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