The Regression Equation for a Categorical Variable with Four Categories

Multiple Choice

The regression equation for a categorical variable with four categories would be modeled as ________.

A) Ŷ _i = a + b₁ D_{1 +} b₂ D_{2 +} b₃D₃
B) Ŷ _i = a + b₁ D_{1 +} b₂ D_{2 +} b₃D_{3 +} b₄D₄
C) Ŷ = b₁ D_{1 +} b₂ D_{2 +} b₃D₃
D) Ŷ = b₁ D_{1 +} b₂ D_{2 +} b₃D_{3 +} b₄D₄